Παραπομπή APA

Hudson, C. . L. (1967). Professional Salesmanship. Staples Press.

Παραπομπή Chicago Style

Hudson, Cyril L. Professional Salesmanship. London: Staples Press, 1967.

Παραπομπή MLA

Hudson, Cyril L. Professional Salesmanship. Staples Press, 1967.