(en) Shirley Shirley, Restoring the tallgrass prairie an illustrated manual for Iowa and the upper Midwest, Iowa City, IA, University of Iowa Press, (ISBN9781587292200, lire en ligne)
(en) Ruth Herzberg et John A. Pearson, The Guide to Iowa's State Preserves, Iowa City IA, University of Iowa Press, , 196 p. (ISBN9780877457749, présentation en ligne), p. 71
(en) L. H. Pammel, R. R. Rothacker, D. Porter, F. D. Butcher, Ada Hayden, Jules Cool Cunningham, J. C. Gilman, John N. Martin et Charlotte M King, « The weed flora of Iowa », Bulletin (Iowa Geological Survey), Published by the Iowa Geological survey, by the State of Iowa, no 4, (lire en ligne)
(en) Rebecca Conard, The biographical dictionary of Iowa, Iowa City, Published for the State Historical Society of Iowa by the University of Iowa Press, (lire en ligne)
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(en) Duane Isely, « Ada Hayden: a tribute », Journal of the Iowa Academy of Science, vol. 96, no 1, , p. 1–5 (lire en ligne [PDF])