APA (7th ed.) Citation

Sears, P. B. (1939). Who are these Americans? The Macmillan company.

Chicago Style (17th ed.) Citation

Sears, Paul B. Who Are These Americans? New York: The Macmillan company, 1939.

MLA (9th ed.) Citation

Sears, Paul B. Who Are These Americans? The Macmillan company, 1939.