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(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
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(en) The Bookmart, Bookmart Publishing Company, , 89 p. (lire en ligne)
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(en) Michigan Legislative Manual and Official Directory, (lire en ligne)
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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)"