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MLA

Hein, M. A, and A. C Cook. Effect of method and rate of grazing on beef production and plant population of pastures at Beltsville, Md. U.S. Dept. of Agriculture, 1937.

APA

Hein, M. A, and Cook, A. C. (1937). Effect of method and rate of grazing on beef production and plant population of pastures at Beltsville, Md. U.S. Dept. of Agriculture.

Chicago

Hein, M. A., and A. C Cook. Effect of method and rate of grazing on beef production and plant population of pastures at Beltsville, Md. U.S. Dept. of Agriculture, 1937.