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.
芝加哥风格引文Griffin, Steven, P. Alan Treffeisen, 与 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引文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.
警告：这些引文格式不一定是100％准确.