Παραπομπή APA

Ernest, J. W., & Ashmun, R. D. (1973). Salesmanship Fundamentals (4th ed.). McGraw-Hill.

Παραπομπή Chicago Style

Ernest, John W., και Richard D. Ashmun. Salesmanship Fundamentals. 4th ed. New York: McGraw-Hill, 1973.

Παραπομπή MLA

Ernest, John W., και Richard D. Ashmun. Salesmanship Fundamentals. 4th ed. McGraw-Hill, 1973.