Cita APA (7th ed.)

Elfenbein, J. (1973). Business letters and communication. Alexander hamilton Inc.

Cita Chicago (17th ed.)

Elfenbein, Julien. Business Letters and Communication. New York: Alexander hamilton Inc, 1973.

Cita MLA (9th ed.)

Elfenbein, Julien. Business Letters and Communication. Alexander hamilton Inc, 1973.