^Lina Mainiero; Langdon Lynne Faust (1979), American Women Writers: A Critical Reference Guide from Colonial Times to the Present (بالإنجليزية), QID:Q106787730
^Gravestone at Olinger Crown Hill Mortuary in Denver, CO and official Denver County Death Certificate. After her marriage, Mary misrepresented her year of birth, declaring it as 1907 when it was actually 1906, hence conflicting birth dates in various sources. Her New York Times obituary makes the same error, along with numerous reference works.
^Wallis Reef, "She Didn’t Write It For Money---She Says", The Saturday Evening Post, Sept 1, 1945, p. 109
^Mary Coyle Chase, personal letter to Helen Cotton, Nov 9, 1971
