↑Michael Blyth Updated: 22 May 2015 (22 May 2015). "10 great romantic horror films". BFI. Retrieved 30 March 2016.{{cite web}}: |author= has generic name (help)CS1 maint: numeric names: authors list (link)
↑Welle, John P. (2004). "Early Cinima, Dante's Inferno of 1911, and the Origins of Italian Film Culture". In Iannucci, Amilcare A. (ed.). Dante, Cinema, and Television. University of Toronto Press. pp.36, 38–40. ISBN0-8020-8827-9.
↑Mira, Alberto. The A to Z of Spanish Cinema. Rowman & Littlefield, 2010. pp. 252
↑Bo Florin (2010), "Victor Sjöström and the Golden Age", Mariah Larsson and Anders Marklund (eds), "Swedish Film: An Introduction and Reader", Lund: Nordic Academic Press, pp. 76-85, p.83
↑"X-Rays". silentera.com. Progressive Silent Film List.
↑Brooke, Michael. "The X-Rays". BFI Screenonline Database. Retrieved 2011-04-24.
↑Kinnard, Roy (1995). Horror in Silent Films. McFarland and Company Inc. p.24. ISBN0-7864-0036-6.
↑Workman, Christopher; Howarth, Troy (2016). Tome of Terror: Horror Films of the Silent Era. Midnight Marquee Press. p.42. ISBN978-1936168-68-2.