Aaker, D. (1999). Marketing research 6th ed.
Lua i Stíl Chicago (17ú heag.)Aaker, David. Marketing Research 6th Ed. New york, 1999.
Lua MLA (9ú heag.)Aaker, David. Marketing Research 6th Ed. 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.