Aaker, D. A. (2002). Marketing Research. Wiley India.
Lua i Stíl Chicago (17ú heag.)Aaker, David A. Marketing Research. Wiley India, 2002.
Lua MLA (9ú heag.)Aaker, David A. Marketing Research. Wiley India, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.