LUCK, D. J. (1978). Marketing Research David Luck. Prentic Hall of India.
Lua i Stíl Chicago (17ú heag.)LUCK, David J. Marketing Research David Luck. Prentic Hall of India, 1978.
Lua MLA (8ú heag.)LUCK, David J. Marketing Research David Luck. Prentic Hall of India, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.