APA (7th ed.) Citation

Thorp, W. L., Berman, E., & Blackett, O. W. (1939). Economic problems in a changing world. Farrar & Rinehart.

Chicago Style (17th ed.) Citation

Thorp, Willard Long, Edward Berman, and Olin Winthrop Blackett. Economic Problems in a Changing World. New York: Farrar & Rinehart, 1939.

MLA (9th ed.) Citation

Thorp, Willard Long, et al. Economic Problems in a Changing World. Farrar & Rinehart, 1939.