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- Roger Ebert. "Metropolis." Roger Ebert. June 2, 2010. December 13, 2018. <https://www.rogerebert.com/reviews/great-movie-metropolis-2010-restoration-1927>.
- Matt Novak. "1927 Magazine Looks at Metropolis, “A Movie Based On Science” Read more: https://www.smithsonianmag.com/history/1927-magazine-looks-at-metropolis-a-movie-based-on-science-4328353/#C7M7GoBORq34BAVK.99 Give the gift of Smithsonian magazine for only $12! http://bit.ly/1cGUiGv Follow us: @SmithsonianMag on Twitter." Smithsonian. July 19, 2012. December 14, 2018. <https://www.smithsonianmag.com/history/1927-magazine-looks-at-metropolis-a-movie-based-on-science-4328353/>.
- Eric D Snider. "12 Futuristic Facts About Metropolis." Mental Floss. July 25, 2016. December 14, 2018. <http://mentalfloss.com/article/83617/12-futuristic-facts-about-metropolis>.