Robinson, O. P. (1950). Successful retail salesmanship (2nd ed.). Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRobinson, O. Preston. Successful Retail Salesmanship. 2nd ed. New York: Prentice-Hall, 1950.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRobinson, O. Preston. Successful Retail Salesmanship. 2nd ed. Prentice-Hall, 1950.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.