HOOLEY, G. J. (1993). Competitive Positioning. bPrentice Hall.
Lua i Stíl Chicago (17ú heag.)HOOLEY, Graham J. Competitive Positioning. bPrentice Hall, 1993.
Lua MLA (8ú heag.)HOOLEY, Graham J. Competitive Positioning. bPrentice Hall, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.