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MLA

Humphrey, H. B. (Harry Baker), and Aaron G. (Aaron Guy) Johnson. "Take-all and Flag Smut : Two Wheat Diseases New to the United States." ,

APA

Humphrey, H. B. (Harry Baker), & Johnson, A. G. (Aaron Guy). (1919). Take-all and flag smut : two wheat diseases new to the United States.

Chicago

Humphrey, H. B. (Harry Baker), and Aaron G. (Aaron Guy) Johnson. "Take-all and flag smut : two wheat diseases new to the United States" (1919):