Keegan, W. (1992). Marketing. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Keegan, Warren. Marketing. New Jersey: Prentice Hall, 1992.
Lua MLA (9ú heag.)Keegan, Warren. Marketing. Prentice Hall, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.