- Horror.com: Cannibal Ferox
 - Impressive collection of screenshots and pictures from Umberto Lenzi's shocking tale of torture and cannibalism, Cannibal Ferox (aka Make Them Die Slowly). - IMDb: Cannibal Ferox
- IMDb page for Cannibal Ferox (aka Make Them Die Slowly), Umberto Lenzi's controversial horror, torture, cannibalism movie extravaganza. Includes cast, crew, and production information, plot summary, and user comments.
- MonsterHunter: Cannibal Ferox
- Summary, review, and criticism of Umberto Lenzi's really, really, really gory spaghetti-horror movie.
- Rotten Tomatoes: Cannibal Ferox
- Rotton Tomatoes page for Cannibal Ferox (aka Make Them Die Slowly) features numerous reviews and articles from a variety of different sources, plot summary, credits, links, and a discussion forum.
- Wikipedia: Cannibal Ferox
- User created page dedicated to Umberto Lenzi's torture and cannibalism Italian exploitation film. Features plot summary, trivia, and some links.
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