Cita APA (7th ed.)

Nichols, R. G., & Stevens, L. A. (1957). Are you listening? (ed.). Mc Graw Hill Book Co..

Cita Chicago (17th ed.)

Nichols, Ralph G., i Leonard A. Stevens. Are You Listening? ed. New York: Mc Graw Hill Book Co., 1957.

Cita MLA (9th ed.)

Nichols, Ralph G., i Leonard A. Stevens. Are You Listening? ed. Mc Graw Hill Book Co., 1957.