R.Cooper, D., & Schindler, P. S. (2006). Marketing research. McGraw Hill.
Lua i Stíl Chicago (17ú heag.)R.Cooper, Donald, agus Pamela S. Schindler. Marketing Research. McGraw Hill, 2006.
Lua MLA (8ú heag.)R.Cooper, Donald, agus Pamela S. Schindler. Marketing Research. McGraw Hill, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.