Cita APA (7th ed.)

Clark, F. E., & Clark, C. P. (1942). Principles of marketing (3rd ed.). Macmillan.

Cita Chicago (17th ed.)

Clark, Fred E., i Carrie Patton Clark. Principles of Marketing. 3rd ed. New York, N.Y.: Macmillan, 1942.

Cita MLA (8th ed.)

Clark, Fred E., i Carrie Patton Clark. Principles of Marketing. 3rd ed. Macmillan, 1942.