Cita APA (7a ed.)

Sandford, W. P., & Yeager, W. H. (1939). Principles of effective speaking: A textbook for colleges and universities (3rd ed. rev. and enlarged.). T. Nelson.

Cita Chicago Style (17a ed.)

Sandford, William Phillips, y Willard Hayes Yeager. Principles of Effective Speaking: A Textbook for Colleges and Universities. 3rd ed. rev. and enlarged. New York: T. Nelson, 1939.

Cita MLA (8a ed.)

Sandford, William Phillips, y Willard Hayes Yeager. Principles of Effective Speaking: A Textbook for Colleges and Universities. 3rd ed. rev. and enlarged. T. Nelson, 1939.