Armstrong, G., & Kotler, P. (1991). Principles of marketing (5th.). Prentice-Hall.
Chicago Style (17th ed.) CitationArmstrong, Gary, and Philip Kotler. Principles of Marketing. 5th. New Jersey: Prentice-Hall, 1991.
MLA (8th ed.) CitationArmstrong, Gary, and Philip Kotler. Principles of Marketing. 5th. Prentice-Hall, 1991.
Warning: These citations may not always be 100% accurate.