Cita APA (7th ed.)

Day, R. L. (1968). Concepts for modern marketing. International Textbook.

Cita Chicago (17th ed.)

Day, Ralph L. Concepts for Modern Marketing. Scranton: International Textbook, 1968.

Cita MLA (9th ed.)

Day, Ralph L. Concepts for Modern Marketing. International Textbook, 1968.