Gaya APA

JR, H, W, B. (1981). Marketing Recearch Text and Cases (Ed,4 - Cet.1). Illinois: Richard D. Irwin Inc.

Gaya MLA

JR, Harper, W., Boyd. "Marketing Recearch Text and Cases". Ed,4 - Cet.1 Illinois: Richard D. Irwin Inc, 1981. Text.