APA (7th ed.) Citation

Smith, E. F., & Ryan, L. A. (1950). Preface to happiness. Benziger.

Chicago Style (17th ed.) Citation

Smith, Elwood F., and Louis A. Ryan. Preface to Happiness. New York: Benziger, 1950.

MLA (8th ed.) Citation

Smith, Elwood F., and Louis A. Ryan. Preface to Happiness. Benziger, 1950.