Donaldson, P. (1998). A question of economics. New York: Penguin Books.
Trích dẫn kiểu ChicagoDonaldson, Peter. A Question of Economics. New York: Penguin Books, 1998.
MLA引文Donaldson, Peter. A Question of Economics. New York: Penguin Books, 1998.
警告：這些引文格式不一定是100％准確.