Cita APA

Nichols, R. G., & Stevens, L. A. 1. (1957). Are you listening? New York, New York: McGraw-Hill.

Citación estilo Chicago

Nichols, Ralp G., y Leonard A. 1920- Stevens. Are You Listening? New York, New York: McGraw-Hill, 1957.

Cita MLA

Nichols, Ralp G., y Leonard A. 1920- Stevens. Are You Listening? New York, New York: McGraw-Hill, 1957.