KOTLER, P. (1999). Principles of marketing ed.8Philip Kotler, Gary Armstrong. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)KOTLER, Philip. Principles of Marketing Ed.8Philip Kotler, Gary Armstrong. Prentice-Hall, 1999.
Lua MLA (8ú heag.)KOTLER, Philip. Principles of Marketing Ed.8Philip Kotler, Gary Armstrong. Prentice-Hall, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.