APA (7th ed.) Citation

penguin books & Galbraith, J. K. (1991). a history of economics: The past as the present. penguin books.

Chicago Style (17th ed.) Citation

penguin books and John Kenneth Galbraith. A History of Economics: The Past as the Present. London: penguin books, 1991.

MLA (8th ed.) Citation

penguin books and John Kenneth Galbraith. A History of Economics: The Past as the Present. penguin books, 1991.