Frye, R. W. (1973). Introduction to the marketing system. Comfield press, 1973.
Dyfyniad Arddull ChicagoFrye, Robert W. Introduction to the Marketing System. Francisco: Comfield press, 1973, 1973.
Dyfyniad MLAFrye, Robert W. Introduction to the Marketing System. Comfield press, 1973, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.