Gaya APA

W, R. (2006). Direct Marketing: the complete ideal's guides (Ed. 1, Cet. 1). Jakata: Kencana Prenada Media Group.

Gaya MLA

W, Robert. "Direct Marketing: the complete ideal's guides". Ed. 1, Cet. 1 Jakata: Kencana Prenada Media Group, 2006. Text.