- Classic Images (US)"William Collier, Sr.; Talented, Magnetic, and Amiable"November 1993 · Iss. 221, pg. 32 et passim · by: Gene Vazzana
- Variety (US)"William Collier, Comedian-Author, 77, Dies on Coast After Long Illness"January 19, 1944 · pg. 62:4 · by: Jack Pulaski
- New York Times (US)"William Collier, Noted Actor, Dies; Stage and Screen Favorite More Than 60 Years Is Stricken on Coast, 77"January 14, 1944 · pg. 19:1
- Motion Picture Classic (US)"The Modern Parable of the Prodigal Son; In the 1925 Version ['The Wanderer'], Willie Collier, Jr., Returns a Success"October 1925 · pg. 38-39, 83 · by: Doris Curran
- Moving Picture World (US)"William Collier, Popular Comedian, Presented by Selznick in a Feature, 'The New Butler'"April 17, 1920 · pg. 394
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