APA (7th ed.) Citation

Simpson, G. G. (1955). The major features of evolution (2nd printing.). Columbia University Press.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. The Major Features of Evolution. 2nd printing. New York: Columbia University Press, 1955.

MLA (9th ed.) Citation

Simpson, George Gaylord. The Major Features of Evolution. 2nd printing. Columbia University Press, 1955.