- Why Me?William Gargan, w/Arnold Hano · 1969
- Hollywood Players: The ThirtiesJames Robert Parish, William T. Leonard · New Rochelle, NY: Arlington House, 1976 · ISBN: 0870003658
- Variety (US)"William Gargan"February 21, 1979 · pg. 130:2
- Los Angeles Times (US)"William Gargan"February 19, 1979 · pg. A3:5
- New York Times (US)"William Gargan, 73, Stage and TV Actor; Musical Star Taught Speech After Losing His Larynx to Cancer"February 18, 1979 · pg. 40:1
- Syracuse American (US)"Howard and Gargan Are Friends, Damon and Pythias of Hollywood"July 8, 1934 · Iss. 591, pg. 5S · by: uncredited
- Hollywood (US)"You Don't Know Bill Gargan!"April 1934 · Vol. 23, Iss. 4, pg. 17 + 62 · by: Clark Warren
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