APA (7th ed.) Citation

Barber, W. J. (1985). A history of economic thought. Penguin Books.

Chicago Style (17th ed.) Citation

Barber, William J. A History of Economic Thought. Harmondsworth, Middlesex, Eng: Penguin Books, 1985.

MLA (9th ed.) Citation

Barber, William J. A History of Economic Thought. Penguin Books, 1985.