APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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