Παραπομπή APA

Cohen, W. A. (1984). Direct response marketing: An enterprencurial approach. john wiley& sons.

Παραπομπή Chicago Style

Cohen, William A. Direct Response Marketing: An Enterprencurial Approach. New York: john wiley& sons, 1984.

Παραπομπή MLA

Cohen, William A. Direct Response Marketing: An Enterprencurial Approach. john wiley& sons, 1984.