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MLA

Fryxell, Paul A. "A Nomenclator of Gossypium : the Botanical Names of Cotton." , 114. Print

APA

Fryxell, P. A. (1976). A nomenclator of Gossypium : the botanical names of cotton.

Chicago

Fryxell, Paul A. "A nomenclator of Gossypium : the botanical names of cotton" (0000): 114.