APA (7th ed.) Citation

Conklin, E. G. (1922). The direction of human evolution (New ed., with preface.). C. Scribner's sons.

Chicago Style (17th ed.) Citation

Conklin, Edwin Grant. The Direction of Human Evolution. New ed., with preface. New York: C. Scribner's sons, 1922.

MLA (9th ed.) Citation

Conklin, Edwin Grant. The Direction of Human Evolution. New ed., with preface. C. Scribner's sons, 1922.