Ferrell, R. W. (1970). Customer-oriented planning. D.B.Taraporewala.
Dyfyniad Arddull ChicagoFerrell, Robert W. Customer-oriented Planning. Mumbai: D.B.Taraporewala, 1970.
Dyfyniad MLAFerrell, Robert W. Customer-oriented Planning. D.B.Taraporewala, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.