Cita APA

Gerber, P. L., & Gerber, P. L. (1961). Effective English. New York, New York: Random House.

Citación estilo Chicago

Gerber, Philip L., y Philip L. Gerber. Effective English. New York, New York: Random House, 1961.

Cita MLA

Gerber, Philip L., y Philip L. Gerber. Effective English. New York, New York: Random House, 1961.