APA (7th ed.) Citation

East, E. M. (1923). Mankind at the crossroads. C. Scribner's sons.

Chicago Style (17th ed.) Citation

East, Edward M. Mankind at the Crossroads. New York, London: C. Scribner's sons, 1923.

MLA (9th ed.) Citation

East, Edward M. Mankind at the Crossroads. C. Scribner's sons, 1923.