APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

Barber, William J. A History of Economic Thought. England: Penguin books, 1967.

MLA (9e ed.) Bronvermelding

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