Barkley, A., & Barkley, P. W. (2013). Principles of agricultural economics. Routledge.
芝加哥风格引文Barkley, Andrew, 与 Paul W. Barkley. Principles of Agricultural Economics. Oxon [England]: Routledge, 2013.
MLA引文Barkley, Andrew, 与 Paul W. Barkley. Principles of Agricultural Economics. Routledge, 2013.
警告：这些引文格式不一定是100％准确.