Tristan and Isolt : a study of the sources of the romance - Loomis, Gertrude Schoepperle, 1882-1921 (New York : B. Franklin, 1960)
Library has Vol. 1 and 2
"A bibliography of Tristan scholarship after 1911": v. 2, p. 588-592. Bibliographical footnotes
Keywords: Tristan (Legendary character) -- Romances -- History and criticism