I keep my medieval reading library mostly up to date on myArmoury.
My reading listI've cut and paste an abbreviated list here:
1. 1066: The Year of the Conquest
2. 1381: The Peel Affinity: An English Knight's Household in the Fourteenth Century
3. 2,500 years of European helmets, 800 B.C.-1700 A.D
4. Age of Chivalry, The
5. Archaeology of Weapons: Arms and Armour from Prehistory to the Age of Chivalry, The
6. Armor: From ancient to modern times
7. Armour and Weapons
8. Armourer and His Craft: From the XIth to the XVIth Century, The
9. Arms & Armor of the Medieval Knight: An Illustrated History of Weaponry in the Middle Ages
10. Arms and Armour
11. Arms And Armour In Antiquity And The Middle Ages (Medieval Military Library)
12. Art of War
13. Basic Heraldry
14. Battle of Salamis: The Naval Encounter that Saved Greece -- and Western Civilization, The
15. Battles of the Medieval World 1000 - 1500
16. Between Pit and Pedestal: Women in the Middle Ages
17. Book of Five Rings, The Classic Text of Samurai Sword Strategy, The
18. Book Of The Medieval Knight, The
19. Booke of Days (Trade)
20. Brassey's Book of Body Armor (Photographic Histories)
21. Castle
22. Compendium of Weapons Armour and Castles, The
23. Costumes for the Stage: A Complete Handbook for Every Kind of Play
24. Czech Fairy-tales: A selection of the most beautiful folk tales
25. Daggers and Fighting Knives of the Western World
26. Edward the Black Prince / the Funeral Achievements
27. Enterprise of War, The
28. European Arms & Armor
29. Everyday Life In Renaissance Times
30. Everyday life of the barbarians: Goths, Franks and Vandals;
31. Feudal Coats of Arms
32. Fighting with the German Longsword
33. Fourteenth-Century Towns (Living History)
34. Guide to Heraldry, A
35. Heraldic Alphabet
36. Heraldry (Brockhampton Reference Series (Popular))
37. Heraldry: Its Origins and Meaning (New Horizons)
38. Historical Atlas of the Medieval World
39. Homer's Iliad Retold
40. Illustrated Encyclopedia of Arthurian Legends
41. Illustrated Encyclopedia of Knives, Daggers & Bayonets: An authoritative history and visual directory of sharp-edged weapons and blades from around ... photographs (Illustrated Encyclopedia of...), Th
42. Introduction to Heraldry, An
43. Italian Medieval Armies 1300-1500 (Men-at-Arms)
44. Königsschloss Neuschwanstein. Schlossbeschreibung - Baugeschichte - Sagen. Englische Ausgabe
45. Knight and His Armor, A
46. Knight and His Castle, A
47. Knight and His Weapons, A
48. Knight in Medieval England, 1000-1400 (Medieval Military Library), The
49. Knight Triumphant: The High Middle Ages, 1314-1485, The
50. Knights
51. Knights Templar
52. Knives and Scabbards (Medieval Finds from Excavations in London)
53. Latehomecomer: A Hmong Family Memoir, The
54. Life in a Medieval Castle
55. Life in a Medieval Village
56. Medieval Art of Love, The ...
57. Medieval Costume and Fashion
58. Medieval Costume in England and France: The 13th, 14th and 15th Centuries
59. Medieval European Armies 1300-1500 (Men at Arms Series, 50)
60. Medieval Mercenaries: The Business of War
61. Medieval Siege Warfare (Elite)
62. Medieval Soldier: 15th Century Campaign Life Recreated in Colour Photographs, The
63. Medieval Warrior, The
64. Navigators: Knights and Castles
65. Normans (Trade Editions), The
66. Outline of Ancient, Medieval & Modern History (College Outline Series), An
67. Patterns for Theatrical Costumes: Garments, Trims, and Accessories from Ancient Egypt to 1915
68. Perfect Heresy : The Revolutionary Life and Death of the Medieval Cathars, The
69. Renaissance, The
70. Ships and Seamanship in the Ancient World
71. Spirit Of The Sword: A Celebration of Artistry and Craftsmanship
72. Sword and the Mind, The Classic Japanese Treatise on Swordsmanship and Tactics, The
73. Sword in Hand:: A History of the Medieval Sword
74. Techniques of Medieval Armour Reproduction: The 14th Century
75. Uppity Women of Medieval Times
76. Warriors of God: Richard the Lionheart and Saladin in the Third Crusade
77. Year 1000: What Life Was Like at the Turn of the First Millennium, The