Ries, A., & Trout, J. (1989). Bottom-up marketing. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Ries, Al, agus Jack Trout. Bottom-up Marketing. New York: McGraw-Hill, 1989.
Lua MLA (9ú heag.)Ries, Al, agus Jack Trout. Bottom-up Marketing. McGraw-Hill, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.