Παραπομπή APA

Schiff, J. (1964). Salesmanship fundamentals. Business books.

Παραπομπή Chicago Style

Schiff, J.S. Salesmanship Fundamentals. New York: Business books, 1964.

Παραπομπή MLA

Schiff, J.S. Salesmanship Fundamentals. Business books, 1964.