Kotler, P., & Armstrong, G. (2001). Principles of marketing (9th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Kotler, Philip, agus Gary Armstrong. Principles of Marketing. 9th ed. Upper Saddle River, N.J. : New Delhi: Prentice Hall, 2001.
Lua MLA (8ú heag.)Kotler, Philip, agus Gary Armstrong. Principles of Marketing. 9th ed. Prentice Hall, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.