APA (7th ed.) Citation

Beer, C. E., & Wiersma, D. (1970). Irrigated corn yields in the North Central Region of the United States. Iowa State Univ.

Chicago Style (17th ed.) Citation

Beer, C. E., and Dan Wiersma. Irrigated Corn Yields in the North Central Region of the United States. Ames, Iowa: Iowa State Univ, 1970.

MLA (9th ed.) Citation

Beer, C. E., and Dan Wiersma. Irrigated Corn Yields in the North Central Region of the United States. Iowa State Univ, 1970.