APA استشهاد

Barber, W. J. (1967). History of economic thought. Penguin Books.

استشهاد بنمط شيكاغو

Barber, William J. History of Economic Thought. Australia: Penguin Books, 1967.

MLA استشهاد

Barber, William J. History of Economic Thought. Penguin Books, 1967.