(en) Tom Weaver, Michael Brunas et John Brunas, Universal Horrors : The Studio's Classic Films, 1931-1946, McFarland, , 616 p. (ISBN978-0-7864-9150-6 et 0-7864-9150-7, lire en ligne), p. 35 — For decades it remained a lost film, scarcely eliciting minimal interest from the studio which produced it.
Bordwell, David & Thompson, Kristen, « Confucius reborn », Davidbordwell.net, (consulté le )
dvdreview.com
« Dracula (1930) », dvdreview.com (consulté le ) : « Universal's original negative had already fallen into nitrate decomposition by the time the negative was rediscovered in the 1970s. »