Gaya APA

Ferrell, W, M, P, ;, O. (1989). Marketing: concepts and strategies (ed. 6). USA: Houghton Mifflin Company Boston.

Gaya MLA

Ferrell, William, M., Pride, ;, O.C.. "Marketing: concepts and strategies". ed. 6 USA: Houghton Mifflin Company Boston, 1989. Text.