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Dyfyniad Arddull ChicagoLevitt, Theodore. Marketing for Business Growth. New York: McGraw-Hill, 1974.
Dyfyniad MLALevitt, Theodore. Marketing for Business Growth. New York: McGraw-Hill, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.