Monopoly and free enterprise.

MLA

Stocking, George Ward, Myron W. Watkins and Twentieth Century Fund. Monopoly and free enterprise. New York : Twentieth Century Fund, 1951.

APA

Stocking, G., Watkins, M. & Twentieth Century Fund. (1951). Monopoly and free enterprise. New York : Twentieth Century Fund.

Chicago

Stocking, George Ward, Myron W. Watkins and Twentieth Century Fund. Monopoly and free enterprise. New York : Twentieth Century Fund, 1951.