APA Style

Ries, A., Trout, J. (2001). The marketing classic: positioning: how to be seen a nd heard in the overcrowded marketplace . New York: Mc Graw-Hill.

MLA Style

Ries, Al., Trout, Jack. "The marketing classic: positioning: how to be seen a nd heard in the overcrowded marketplace". New York: Mc Graw-Hill, 2001. Manajemen.