APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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