(en) Roy Fowler et Rodney Giesler, « Interview with Tudor Gates - Side Five », British Entertainment History Project, (lire en ligne)
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(en) David Huckvale, Touchstones of Gothic Horror: A Film Genealogy of Eleven Motifs and Images, McFarland & Co, (ISBN978-0786447824, lire en ligne), p. 105
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(en) Marcus Hearn et Alan Barnes, "Lust for a Vampire". The Hammer Story: The Authorised History of Hammer Films [The Hammer Story] (Limited ed.), Titan Books, (ISBN978-1845761851, OCLC493684031), p. 142