Παραπομπή APA

Leterman, E. G. (1973). Modern business: Sales and sales management. Alexander Hamilton Institute.

Παραπομπή Chicago Style

Leterman, Elmer G. Modern Business: Sales and Sales Management. New York: Alexander Hamilton Institute, 1973.

Παραπομπή MLA

Leterman, Elmer G. Modern Business: Sales and Sales Management. Alexander Hamilton Institute, 1973.