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Dyfyniad Arddull ChicagoAlexander, Ralph S., James S. Cross, and Richard M. Hill. Industrial Marketing. 3rd ed. Bombay: Taraporevala, 1972.
Dyfyniad MLAAlexander, Ralph S., et al. Industrial Marketing. 3rd ed. Taraporevala, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.