APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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