Levitt, T. (1962). Innovation in marketing: New perspectives for porfit and growth. McGraw Hill book company.
Dyfyniad Arddull ChicagoLevitt, Theodore. Innovation in Marketing: New Perspectives for Porfit and Growth. New York: McGraw Hill book company, 1962.
Dyfyniad MLALevitt, Theodore. Innovation in Marketing: New Perspectives for Porfit and Growth. McGraw Hill book company, 1962.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.