ETZEL, M. (2010). MARKETING (14TH.). TMH.
Lua i Stíl Chicago (17ú heag.)ETZEL, MICAEL. MARKETING. 14TH. NEW DELHI: TMH, 2010.
Lua MLA (9ú heag.)ETZEL, MICAEL. MARKETING. 14TH. TMH, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.