APA (7th ed.) Citation

Kotler, P., & Armstrong, G. (1981). Principles of marketing. 24K Printing.

Chicago Style (17th ed.) Citation

Kotler, Philip, and Gary Armstrong. Principles of Marketing. Manila, Philippines: 24K Printing, 1981.

MLA (9th ed.) Citation

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 24K Printing, 1981.

Warning: These citations may not always be 100% accurate.