Kotler, P. (1991). Principles of marketing (5th.). Prentic Hall.
Lua i Stíl Chicago (17ú heag.)Kotler, Philip. Principles of Marketing. 5th. New Delhi: Prentic Hall, 1991.
Lua MLA (9ú heag.)Kotler, Philip. Principles of Marketing. 5th. Prentic Hall, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.