Kotler, P. (1988). Principles of marketing. New Delhi: Prentice-Hall.
Dyfyniad Arddull ChicagoKotler, Philip. Principles of Marketing. New Delhi: Prentice-Hall, 1988.
Dyfyniad MLAKotler, Philip. Principles of Marketing. New Delhi: Prentice-Hall, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.