APA aipamena

Griffin, S., Treffeisen, P. A., & Heady, E. O. (1978). Iowa's commercial farms: An analysis of the USDA cost of production survey. Center for Agricultural and Rural Development, Iowa State University.

Chicago Style aipamena

Griffin, Steven, P. Alan Treffeisen, and Earl O. Heady. Iowa's Commercial Farms: An Analysis of the USDA Cost of Production Survey. Ames, Iowa: Center for Agricultural and Rural Development, Iowa State University, 1978.

MLA aipamena

Griffin, Steven, et al. Iowa's Commercial Farms: An Analysis of the USDA Cost of Production Survey. Center for Agricultural and Rural Development, Iowa State University, 1978.