Παραπομπή APA

Elfenbein, J. (1973). Modern business: Buisness letters and communications. Robert Hale.

Παραπομπή Chicago Style

Elfenbein, Julien. Modern Business: Buisness Letters and Communications. London: Robert Hale, 1973.

Παραπομπή MLA

Elfenbein, Julien. Modern Business: Buisness Letters and Communications. Robert Hale, 1973.