APA (7th ed.) Citation

Knox, J. S., & Knox, J. J. (1952). A modern course in salesmanship. Knox Business Book Co.

Chicago Style (17th ed.) Citation

Knox, James Samuel, and John Jay Knox. A Modern Course in Salesmanship. Oak Park, Ill: Knox Business Book Co, 1952.

MLA (9th ed.) Citation

Knox, James Samuel, and John Jay Knox. A Modern Course in Salesmanship. Knox Business Book Co, 1952.