David Lewin, "Amfortas' Prayer to Titurel and the Role of D in Parsifal: The Tonal Spaces of the Drama and the Enharmonic Cb/B," in Studies in Music with Text (New York: Oxford University Press, 2006), 183-200.
David Lewin: "Amfortas' Prayer to Titurel and the Role of D in Parsifal: The Tonal Spaces of the Drama and the Enharmonic Cb/B" i Studies in Music with Text (New York: Oxford University Press, 2006), s. 183-200.