APA (7th ed.) Citation

Perkins, E. J. (1983). The world economy in the twentieth century. Schenkman Pub. Co..

Chicago Style (17th ed.) Citation

Perkins, Edwin J. The World Economy in the Twentieth Century. Cambridge, Mass.: Schenkman Pub. Co., 1983.

MLA (9th ed.) Citation

Perkins, Edwin J. The World Economy in the Twentieth Century. Schenkman Pub. Co., 1983.