Goel, B. (2006). History and dev of marketing research.
Lua i Stíl Chicago (17ú heag.)Goel, B. History and Dev of Marketing Research. New Delhi, 2006.
Lua MLA (9ú heag.)Goel, B. History and Dev of Marketing Research. 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.