Here is a list of suggested reading and historical sources that SCA equestrians may find very helpful.
This list was compiled by Neil Grant, a horseman and re-enactor from England.

WARHORSES AND RELATED

BOOKS

Anglo, Sydney "The martial arts of renaissance Europe" 2000, ISBN 0300083521- has two chapters on horsemanship
Ayton, Andrew “Knights and warhorses”
Brereton, JM "The horse in war" 1976
Chacon, Hernan "Tractado de la caualleria de la gineta. introduction, text and notes" Ed Noel Fellows 1999. 1551 light cavalry manual.
Davis, RHC "The medieval warhorse" 1989
Dent AA and Cawley Ac "Chaucer and the horse" 1959
Dent AA & Goodall, DM "The foals of Epona" 1962
Dent AA "horses in Shakespeare's England" 1987.
Edwards, P "The horse trade in Tudor & Stuart England" 1988
Gilbey, Sir W, "The great horse, or the war horse from the time of the roman invasion till its development into the shire horse”, 1899
Gladitz, C "Horse breeding in the medieval world"
Goodall, DM "A history of horse breeding" 1977
Grisone, Federigo "The rules of horsemanship" 1550
Hewitt, HJ "The organization of war under Edward III 1338-62" 1966
Hewit HJ " The horse in medieval England" 1983.
Hyland, Ann “The Medieval Warhorse from Byzantium to the Crusades”
Hyland, Ann “The warhorse 1250 – 1600”
Hyland, Ann “The horse in the middle ages”
Jankovich, Miklos "They rode into Europe" 1971
King, EJ "The rule statutes and customs of the hospitallers 1099-1310" 1934
Langdon, J "Horses, oxen and technical innovation" 1986
Liedtke, W "The royal horse and rider: painting, sculpture and horsemanship 1500-1800" 1989 ISBN 0-89835-267-3
Loch, S "The royal horse of Europe" 1986
Museum of London “The medieval horse and its equipment”
Oakeshott, Ewart “A knight and his horse”
Powicke, M "military obligation in medieval England, a study in liberty and duty" 1962
Reese MM "The royal office of master of the horse" 1976
Seth-Smith, Michael “The horse in war” 1979
Sioned Davies and Nerys Anne Hughes (eds) "The horse in Celtic culture; medieval welsh perspectives", 1997
Smith, G Rex “Medieval Muslim horsemanship”
Thirsk, J "horses in early modern England; for service, for pleasure, for power" Reading, 1978

ARTICLES
Ayton, Andrew “Arms, armor and horses” in Keen, “Medieval Warfare”
Bachrach, BS "Charlemagne's cavalry: myth and reality" Military affairs XLVII 1983 181-7
Bachrach, BS "Some observations on the military administration of the Norman conquest" Anglo-Norman studies VIII (1985) 1-25
Bachrach, BS, 1988 "Caballus et caballarius" in Chickering HD & Seiler TH "The study of chivalry: resources and approaches" p173-211.
Bachrach, BS, 1983 "Animals in warfare in early medieval Europe" Septimane vol XXXI 707-64
Bennet M "La regule du temple as a military manual" Studies in medieval history presented to R Allen Brown 1989, eds C Harper Bill et al.
Brown, RA “The status of the Norman knight” in “war and government in the middle ages: essays in honour of JO Prestwich” ed Gillingham JB and Holt, JC
Chard T "Did the first Spanish horses landed in Carolina and Florida leave progeny?" American anthropology 42 (1940) 90-106
Clapham, JH "The horsing of the Danes" EHR XXXV 1910, PP287-93
Darmer, DL "Some livestock price movements in thirteenth-century England" Economic history review (2nd ser) 22 no 1, 1-16
Davis, RHC - "Did the Anglo-Saxons have warhorses?" in Weapons & warfare in Anglo-Saxon England, ed Sonia Chadwick Hawkes 1989 p 141-144
Davis, RHC "The medieval warhorse" in FML Thomson "Horses in European economic history"
Davis, RHC "The Warhorses of the Normans", Anglo Norman studies 1987.
Dent AA "Chaucer and the medieval horse" proceedings of the Leeds philosophical and literary society IX (1959-62)
Edwards, PR "The horse trade of Chester in the sixteenth and seventeenth centuries" Journal of the Chester arch soc 62 (1979)
Fallows, Noel "Un texto inedito sobre la caballeria del renacimento espanol" Hispanic Studies TRAC vol 14 Liverpool University press 1996
Glover, R "English warfare in 1066" EHR vol LXVII, Jan 1952.
Gillmor, CM "Naval logistics of the cross-channel operation 1066" in Brown, RA "Proceedings of the battle conference 1984" (Anglo Norman studies VII 1985 105-31
Gillmor, Caroll “Practical chivalry: the training of horses for tournaments and warfare” Studies in medieval and renaissance history (New Series) XIII 1992 P5-29
Kindrick, Robert L “The ‘unknightly knight’: teaching satires on chivalry” in " in Chickering HD & Seiler TH "The study of chivalry: resources and approaches" p663-682
Langdon, J 1982 "The economics of horses and oxen in medieval England " Agricultural history review 30, 31-40
Langdon j 1984 "Horse hauling: a revolution in vehicle transport in the twelfth and thirteenth century England?" past and present 103, 37-66
Littauer MA "Early horseshoe problems again" Antiquity 42, 1968
Lydon JF "The Hobelar: an Irish contribution to medieval warfare" Irish sword II 1954-6 12-16
Marshall, CS "The use of the charge in battles in the east 1192-1291" Historical research LXIII 1990 p 221-6
Masson G, "Horse management in medieval and renaissance Italy" Country Life Annual 1952 (well, it's worth a try!)
McDonald, Jill P “Chivalric education in Wolfram’s ‘Parzival’ and Gottfried’s ‘Tristan’" in Chickering HD & Seiler TH "The study of chivalry: resources and approaches" p473-490.
Millar GJ "The Albanian stradiot" History today 16, 1976 468-72
Morris JE 1914a "Mounted infantry in medieval warfare" TRHS (3rd ser) 8, 77-102
Nicol D "The impact of the European couched lance on medieval Muslim military tradition" Journal of the arms and armour soc vol X, 1980 (I'd have thought it was sort of SPLAT!)
Peirce, Ian “The knight, his arms and armour in the eleventh and twelfth centuries in "The ideals and practice of medieval knighthood; papers from the first and second strawberry hill conferences" eds C Harper-bill and Ruth Harvey 1986 p 152-164
Powicke, M "The general obligation to cavalry service under Edward I" Speculum 28, 814-33 1953
Prior CM "The royal studs of the sixteenth and seventeenth centuries" Horse & Hound 1935 p10-38
Pryor JN "Transportation of horses by sea during the era of the crusades" Mariner's mirror 68, 1982
Richardson HG 1942 "The medieval ploughteam" History 26, 287-96
Seidel, Linda “Early medieval images of the horseman re-viewed" in Chickering HD & Seiler TH "The study of chivalry: resources and approaches" p373-400.
Sergeantson, Waldron & Bracegirdle "Medieval horses from Kingston-upon-Thames" London Archaeologist 7, 1992
Sutton, AF "John Nelyngton, Supplier of saddlery to Richard III" The Richardan 6
Svinhufvud, Ac "A late middle English treatise on horses" Stockholm studies in English 47, 1978

TOURNAMENTS AND RELATED
Anglo, Sydney "Le Jeu de la hache. A fifteenth-century treatise on the teaching of chivalric combat" Archaeologica 109 (191) 113-28
Anglo, S "Financial and Heraldic records of the English Tournament"
Anglo, Sidney "How to win at tournaments: the techniques of chivalric combat" Antiquaries journal LXVII 1988 P248-264
Anglo, Sidney "Score cheques and lists" Journal of the society of archivists vol II no 4 1961
Annunziata, Anthony “Teaching the Pas d’armes” in “The study of chivalry – approaches and resources” eds Chickering, H and Seiler, TH p557-582
Barber, R and Barker, J “Tournaments”
Barker J "The tournament in England 1100-1400" 1986
Benson, Larry D "The tournament in the romances of chretien de troyes & L'histoire de Guillaume le marechal" in "Chivalric literature: essays on relations between literature and life in the later middle ages" Eds Benson, Larry D and Leyerle, John 1980 REPRINTED in "Contradictions from Beowulf to Chaucer: selected studies of Larry D Benson" Ed Andersson TM & Barney, SA 1995 - GOT IT
Jackson, WH "The tournament and chivalry in German tournament books of the sixteenth century and in the literary works of emperor maximilian 1" in "The ideals and practice of medieval knighthood; papers from the first and second strawberry hill conferences" eds C Harper-bill and Ruth Harvey 1986 p 49-73
Lull, Ramon "Ramon Lull's book of knighthood and chivalry" tr Johnson WJ 1977 OR Adams, R 1991
Lyssons, s "Copy of purchases for tournament at Windsor park 6 Edward " Archaeologica XVII (1814)! p297-310
Nickel, Helmut “The Tournament an Historical sketch” in “The study of chivalry – approaches and resources” eds Chickering, H and Seiler, TH p213-262
Rene of Anjou, 1460 “Forme et devis d’un tourney”, AKA "King Rene’s tournament book" tr E Bennet 1998
Vale, Juliet "Edward III and chivalry: chivalric society and its context 1270-1350" 1982
Vale, Malcolm "War and chivalry" 1981
Young, Alan "Tudor and Jacobean tournaments"