Parasuraman, A. (2004). Marketing research. Biztantra.
Lua i Stíl Chicago (17ú heag.)Parasuraman, A. Marketing Research. New Delhi: Biztantra, 2004.
Lua MLA (9ú heag.)Parasuraman, A. Marketing Research. Biztantra, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.