Benham, L., & Brozen, Y. (1975). Advertising, competition, and the price of eyeglasses. American Enterprise Institute.
Čikaški stil citiranja (17. izdanje)Benham, Lee, i Yale Brozen. Advertising, Competition, and the Price of Eyeglasses. Washington, D. C: American Enterprise Institute, 1975.
MLA način citiranja (9. izdanje)Benham, Lee, i Yale Brozen. Advertising, Competition, and the Price of Eyeglasses. American Enterprise Institute, 1975.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.