Haymes, Edward R, From Romance to Ritual: Wolfram, Arthur, and Wagner's Parsifal, in Mancoff, Debra N, The Arthurian Revival. Essays on Form, Tradition, and Transformation, Garland Reference Library of the Humanities, 1419, Garland, New York (u.a.), 1992, 174-190

Rezeption (sekundär - Neuzeit):

Wagner, Richard: