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Barber, Richard W. The Holy Grail: Imagination and Belief. Cambridge, MA: Harvard University Press, 2004.
de Motte, Earle. The Grail Quest: Search for Transcendence. Burwood North, NSW: Supreme Grand Lodge of AMORC, 2003.
Dover, Carol, ed. A Companion to the Lancelot-Grail cycle. Cambridge: D.S. Brewer, 2003.
Jung, Emma and Marie-Louise von Franz. The Grail Legend. Princeton, NJ: Princeton University Press, 1998.
Littleton, C. Scott. From Scythia to Camelot: a Radical Reassessment of the legends of King Arthur, the Knights of the Round Table, and the Holy Grail. New York: Garland, 2000.
Lacy, Norris J. ed. Lancelot-Grail: the Old French Arthurian Vulgate and post-Vulgate in translation. 5 volumes. New York: Garland Publishing, 1993-1996.
Loomis, Roger Sherman. The Grail: from Celtic myth to Christian symbol. Princeton, NJ: Princeton University Press, 1991.
Markale, Jean. The Grail: the Celtic Origins of the Sacred Icon. Rochester, VT: Inner Traditions, 1999.
Matthews, John. The Elements of the Grail Tradition. Shaftesbury, Dorset; Rockport, MA: Element Books, 1991.
_____________. Sources of the Grail: an anthology. Hudson, NY: Lindisfarne Press, 1997.
Rolt-Wheeler, Francis. Mystic Gleams from the Holy Grail: The Legend of Spiritual Chivalry, the Mystery of its Divine Origin, its Secret in the World of Faerie and its High Initiation. London: Rider & Co, nd [1950s].
Weston, Jessie L. From Ritual to Romance. Princeton: Princeton University Press, 1993. Available at http://www.sacred-texts.com/neu/frr/#contents. Controversial but seminal.
Williams, Charles. Arthurian Poets: Charles Williams. Woodbridge & Rochester, NY 1991.
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