L., H., E.(1996).Successful marketing research : the complete guide to getting and using essential information about your customers and competitors / Edward L. Hester .New York:John Wiley n Sons.
Gaya MLA
Hester, Edward, L.."Successful marketing research : the complete guide to getting and using essential information about your customers and competitors / Edward L. Hester".New York:John Wiley n Sons,1996.Textbook.