APA
Kotler P., Armstrong G., . (1999). Principles of marketing. New Delhi: Prentice Hall.
Chicago
Kotler Philip, Armstrong Gary, . 1999. Principles of marketing. New Delhi: Prentice Hall.
Harvard
Kotler P., Armstrong G., . (1999). Principles of marketing. New Delhi: Prentice Hall.
MLA
Kotler Philip, Armstrong Gary, . Principles of marketing. New Delhi: Prentice Hall. 1999.