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