Gaya APA

Pride, W, M., Ferrell, O. (1989). Marketing : Concepts and Strategies (Sixth . Ed.). Texas: Houghton Mifflin Company.

Gaya MLA

Pride, William, M.., Ferrell, O.C.. "Marketing : Concepts and Strategies". Sixth . Ed. Texas: Houghton Mifflin Company, 1989. Text.