Cohen, W. A. (1984). Direct response marketing: An enterprencurial approach. john wiley& sons.
Dyfyniad Arddull ChicagoCohen, William A. Direct Response Marketing: An Enterprencurial Approach. New York: john wiley& sons, 1984.
Dyfyniad MLACohen, William A. Direct Response Marketing: An Enterprencurial Approach. john wiley& sons, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.