Gaya APA

(AP), J, W, T, M, C. (2012). Successfull Selling With Peak Performance (18 tip mempertahankan mental dan fisik salesman dan sales supervisor) (Cet 1). JAKARTA: PT. ELEK MEDIA KOMPUTINDO.

Gaya MLA

(AP), Jenu, Widjaja, Tandjung,, MM,, CPM. "Successfull Selling With Peak Performance (18 tip mempertahankan mental dan fisik salesman dan sales supervisor)". Cet 1 JAKARTA: PT. ELEK MEDIA KOMPUTINDO, 2012. Text.