Luck, D. J., & Rubin, R. S. (1987). Marketing research (7th ed.). Prentice-Hall / pvt. Ltd..
Lua i Stíl Chicago (17ú heag.)Luck, David Johnston, agus Ronald S. Rubin. Marketing Research. 7th ed. Englewood Cliffs, NJ ; New Delhi: Prentice-Hall / pvt. Ltd., 1987.
Lua MLA (8ú heag.)Luck, David Johnston, agus Ronald S. Rubin. Marketing Research. 7th ed. Prentice-Hall / pvt. Ltd., 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.