1. What Consumers Think of Coupons;A. C. Nielsen Co.;The Nielsen Researcher,1972
2. Couponing as a Promotional Tool: Consumers Do Benefit;Antil;The Journal of Consumer Affairs,1985
3. Gallo , A. E. L. G. Hamm J. A. Zeller 1982 Couponing's Growth in Food Marketing
4. A Price Discrimination Theory of Coupons;Narasimhan;Marketing Science,1984
5. N. Y. Times News Service 1985 Companies Find Coupons Spur Sales