- Variety (US)"Joseph W. Engel"April 21, 1943 · pg. 54:1
- New York Times (US)"J. W. Engel Dead; Movie Pioneer, 60. Retired Producer a Founder of Universal, Famous Players and the Metro Company. Discoverer of Valentino. Helped on Bernhardt's First Starring Picture--Made Talkie, 'Hell's Angels'"April 20, 1943 · pg. 24:2
- Moving Picture World (US)"'Joe' Engel, a Metro Founder, Joins Ranks of Producers"December 6, 1924 · pg. 509
- Moving Picture World (US)"Course of Film Empire Sways to South; So Declares Treasurer Joseph W. Engel of Metro Following Visit to Florida--Pictures Gaining in Havana"April 22, 1916 · pg. 624:1
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