Sources listed in the author's note:
- All books: Malory's Le Morte D Arthur (henceforth referred to as "Malory")
- Book One:
- R. G. Collingwood's Roman Britain
- "the pseudo-history of Geoffrey of Monmouth" (Historia Regum Britanniae)
- "the verse chronicle of Layamon"
- Malory
- Balyn in the Grail Chapel: the French Merlin
- Nimue's imprisoning of Merlin: the Middle-English prose romance of Merlin
- Book Two:
- "Sir Gawain and the Green Knight": Sir Gawain and the Green Knight
- Launcelot's first quest: Malory
- Launcelot's arrival at Camelot: Le Livre de Lancelot del Lac
- "Sir Gareth, or The Knight of the Kitchen": Malory
- "Sir Tristram and the Fair Iseult": Tristan and Iseult (Godfrey of Strasbourg version)
- "Geraint and Enid": the Mabinogion, Erec and Enide (Chrétien de Troyes)
- "Sir Gawain and the Lady Ragnell": The Wedding of Sir Gawain and Dame Ragnelle (poem), "The Marriage of Sir Gawain" (ballad)
- Percivale's early adventures: "another Middle-English poem", Conte du Graal (Chrétien de Troyes)
- "The Story of Launcelot and Elaine": Malory
- Book Three:
- Malory
- Gawain's adventures at the Grail Castle: Synopsis of Diu Crône (Heinrich von dem Türlin) from Alfred Nutt's Studies on the Legend of the Holy Grail
- Final adventures of Percivale: Synopsis of Parzival from Alfred Nutt's Studies on the Legend of the Holy Grail
- Book Four:
- Malory
- The finding of the graves: "a medieval Latin chronicle"
- The shepherd and the cavern: Arthur of Britain by Edmund Chambers
- Unspecified: The Evolution of Arthurian Romance by J. D. Bruce
