Bradley, N. (2010). Marketing research: Tools & techniques (2nd ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Bradley, Nigel. Marketing Research: Tools & Techniques. 2nd ed. Oxford ; New York: Oxford University Press, 2010.
Lua MLA (8ú heag.)Bradley, Nigel. Marketing Research: Tools & Techniques. 2nd ed. Oxford University Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.