(en) Willard, Frances Elizabeth et Mary Ashton Rice, A woman of the century; fourteen hundred-seventy biographical sketches accompanied by portraits of leading American women in all walks of life., Buffalo, N.Y., Charles Wells Moulton. (1re éd. 1893) (lire en ligne), pp. 310–311
(en) Henry Duff Traill, Literature, Arno Press, (lire en ligne)
(en) Debra J. Sheffer Ph.D, The Buffalo Soldiers: Their Epic Story and Major Campaigns, Bloomsbury Publishing USA, (ISBN978-1-4408-2983-3, lire en ligne)
(en) The Current: Politics, Literature, Science and Art, Current Company, (lire en ligne), p. 175
(en) The Chautauquan, Chautauqua Press, (lire en ligne), p. 210, 401, 591
(en) The Bookmart, Bookmart Publishing Company, , 89 p. (lire en ligne)
(en) Fourth Estate: A Weekly Newspaper for Publishers, Advertisers, Advertising Agents and Allied Interests, Fourth Estate Publishing Company, (lire en ligne)
(en) Michigan Legislative Manual and Official Directory, (lire en ligne)
loc.gov
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Ada Iddings Gale, « What Will Time Give? », The Olneyville Times, , p. 4 (lire en ligne, consulté le )
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(en) Some Notable Women of the Albion, Michigan Area, Michigan, Ablion Branch of the American Association of University Women, (lire en ligne), p. 124, "Thomason, Ada Iddings Gale (1855-1915)"
