Cox, K. K. (1967). Readings in market research. Appleton-Century-Crofts.
Lua i Stíl Chicago (17ú heag.)Cox, Keith K. Readings in Market Research. s.l: Appleton-Century-Crofts, 1967.
Lua MLA (9ú heag.)Cox, Keith K. Readings in Market Research. Appleton-Century-Crofts, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.