Não informado. (1914). Annual report of the Iowa Agricultural Experiment Station. Iowa State College of Agriculture and Mechanic Arts.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annual Report of the Iowa Agricultural Experiment Station. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts, 1914.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annual Report of the Iowa Agricultural Experiment Station. Iowa State College of Agriculture and Mechanic Arts, 1914.
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