Ries, A. Marketing Warfare.
Lua i Stíl Chicago (17ú heag.)Ries, Al. Marketing Warfare.
Lua MLA (9ú heag.)Ries, Al. Marketing Warfare.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)