APA (7th ed.) Citation

Columbia University & Bridgwater, W. (1950). The Columbia encyclopedia (2nd ed.). Columbia University Press.

Chicago Style (17th ed.) Citation

Columbia University and William Bridgwater. The Columbia Encyclopedia. 2nd ed. New York: Columbia University Press, 1950.

MLA (9th ed.) Citation

Columbia University and William Bridgwater. The Columbia Encyclopedia. 2nd ed. Columbia University Press, 1950.