Cita APA (7th ed.)

Bolling, C. (1930). Retail Salesmanship (2nd.). Isaman Pitman.

Cita Chicago (17th ed.)

Bolling, C. Retail Salesmanship. 2nd. London: Isaman Pitman, 1930.

Cita MLA (9th ed.)

Bolling, C. Retail Salesmanship. 2nd. Isaman Pitman, 1930.