Hise, R. T. (1977). Product/service strategy. Petrocelli/Charter.
Dyfyniad Arddull ChicagoHise, Richard T. Product/service Strategy. New York: Petrocelli/Charter, 1977.
Dyfyniad MLAHise, Richard T. Product/service Strategy. Petrocelli/Charter, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.