Cita APA (7th ed.)

Clarke, E. L. (1929). The art of straight thinking: A primer of scientific method for social inquiry. Appleton-Century.

Cita Chicago (17th ed.)

Clarke, Edwin Leavitt. The Art of Straight Thinking: A Primer of Scientific Method for Social Inquiry. New York: Appleton-Century, 1929.

Cita MLA (9th ed.)

Clarke, Edwin Leavitt. The Art of Straight Thinking: A Primer of Scientific Method for Social Inquiry. Appleton-Century, 1929.