Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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