Gaya APA

TANDJUNG, J, W. (2012). SUCCESSFUL SELLING WITH PEAK PERFORMANCE : 18 TIP MEMPERTAHANKAN MENTAL DAN FISIK SALESMAN DAN SALES SUPERVISOR . Jakarta: PT.Elex Media Komputindo.

Gaya MLA

TANDJUNG, JENU, WIDJAJA. "SUCCESSFUL SELLING WITH PEAK PERFORMANCE : 18 TIP MEMPERTAHANKAN MENTAL DAN FISIK SALESMAN DAN SALES SUPERVISOR". Jakarta: PT.Elex Media Komputindo, 2012. Text.