- Steinbeck: A Life in LettersElaine Steinbeck, Robert Wallsten · New York: Penguin Books, 1989 · ISBN: 0140042881
- Hollywood Bohemia: The Roots of Progressive Politics in Rob Wagner's ScriptRob Leicester Wagner · Santa Maria, Calif: Janaway Publishing Inc., 2016 · ISBN: 1596413697
- Redlands Daily Facts (US)"Film Togetherness? Max Wagner isn't so Lonely Today"September 23, 1959 · pg. 12 · by: Erskine Johnson
- Los Angeles Times (US)"Ruth B. Clarke becomes Mrs. Maxwell Wagner"January 4, 1952 · pg. 1, Section II
- Picture-Play Magazine (US)"The Strolle"June 1928 · pg. 44 · by: Carroll Graham
- Los Angeles Times (US)"Kelly Due to Take Witness Stand Today"May 18, 1927 · pg. 35
- Los Angeles Times (US)"New Charges Face Actress"May 15, 1927 · pg. 58
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