Carlson, L. M. (2005). William J. Spillman and the birth of agricultural economics. University of Missouri Press.
芝加哥风格引文Carlson, Laurie M. William J. Spillman and the Birth of Agricultural Economics. Columbia: University of Missouri Press, 2005.
MLA引文Carlson, Laurie M. William J. Spillman and the Birth of Agricultural Economics. University of Missouri Press, 2005.
警告：这些引文格式不一定是100％准确.