Churchill, G. (1999). Marketing research (7th.). Drydon Press.
Lua i Stíl Chicago (17ú heag.)Churchill, G. Marketing Research. 7th. New York: Drydon Press, 1999.
Lua MLA (9ú heag.)Churchill, G. Marketing Research. 7th. Drydon Press, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.