WENTZ WALTER B. (1979). MARKETING. WEST PUBLICATIONS COMPANY.
Lua i Stíl Chicago (17ú heag.)WENTZ WALTER B. MARKETING. BOSTON: WEST PUBLICATIONS COMPANY, 1979.
Lua MLA (9ú heag.)WENTZ WALTER B. MARKETING. WEST PUBLICATIONS COMPANY, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.