Cita APA (7th ed.)

Elfenbein, J. (1972). Business letters and communications (1a. ed.). Alexander Hamilton Institute.

Cita Chicago (17th ed.)

Elfenbein, Julien. Business Letters and Communications. 1a. ed. Nueva York: Alexander Hamilton Institute, 1972.

Cita MLA (9th ed.)

Elfenbein, Julien. Business Letters and Communications. 1a. ed. Alexander Hamilton Institute, 1972.