APA (7e ed.) Bronvermelding

Gelb, G. M., & Gelb, B. D. (1977). Insights for marketing management (Second edition.). Goodyear Publishing Company, Inc.

Chicago (17e ed.) Bronvermelding

Gelb, Gabriel M., en Betsy D. Gelb. Insights for Marketing Management. Second edition. Santa Monica, California: Goodyear Publishing Company, Inc, 1977.

MLA (9e ed.) Bronvermelding

Gelb, Gabriel M., en Betsy D. Gelb. Insights for Marketing Management. Second edition. Goodyear Publishing Company, Inc, 1977.