Tohutoro APA (7th ed.)

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

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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