Roth 1978, p. 342. Roth, Lane (1978). ""Metropolis", The Lights Fantastic: Semiotic Analysis of Lighting Codes in Relation to Character and Theme". Film Quarterly. 6 (4): 342–346. JSTOR43795693.
"Metropolis (1927)"Archived 10 October 2017 at the Wayback MachineScience Fiction Film History. Retrieved 15 May 2013. Quote: "Although the first science fiction film is generally agreed to be Georges Méliès' A Trip To The Moon (1902), Metropolis (1926) is the first feature length outing of the genre."
"Metropolis (1927)"Archived 10 October 2017 at the Wayback MachineScience Fiction Film History. Retrieved 15 May 2013. Quote: "Although the first science fiction film is generally agreed to be Georges Méliès' A Trip To The Moon (1902), Metropolis (1926) is the first feature length outing of the genre."
"Metropolis". Film Portal. Archived from the original on 14 April 2019. Retrieved 10 January 2019.