APA (7th ed.) Citation

Bentley, E. C. (1950). Elephant's work, an enigma ([1st American ed.].). Knopf.

Chicago Style (17th ed.) Citation

Bentley, E. C. Elephant's Work, an Enigma. [1st American ed.]. New York: Knopf, 1950.

MLA (9th ed.) Citation

Bentley, E. C. Elephant's Work, an Enigma. [1st American ed.]. Knopf, 1950.