FRANK H. Robert. (2009). Principles of Economics: Brief Edition. McGraw Hill.
芝加哥风格引文FRANK H. Robert. Principles of Economics: Brief Edition. New York: McGraw Hill, 2009.
MLA引文FRANK H. Robert. Principles of Economics: Brief Edition. McGraw Hill, 2009.
警告：这些引文格式不一定是100％准确.