Winkler, J. (1972). Winkler on marketing planning. Hutchinson.
Dyfyniad Arddull ChicagoWinkler, John. Winkler on Marketing Planning. London: Hutchinson, 1972.
Dyfyniad MLAWinkler, John. Winkler on Marketing Planning. Hutchinson, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.