Silver, L. &. o. The Essentials of Marketing Research. London.
Lua i Stíl Chicago (17ú heag.)Silver, Lawrence & others. The Essentials of Marketing Research. London.
Lua MLA (9ú heag.)Silver, Lawrence & others. The Essentials of Marketing Research. London.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.