RIES, A. (1986). Marketing Warefore. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)RIES, A.I. Marketing Warefore. McGraw-Hill, 1986.
Lua MLA (8ú heag.)RIES, A.I. Marketing Warefore. McGraw-Hill, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.