Gaya APA
CROM, J, O, C, D, M.
(2012).
THE SALES ADVANTAGE
.
JAKARTA:
PENERBIT ERLANGGA.
Gaya MLA
CROM, J., OLIVER, CROM,, DAN, MICHAEL.
"THE SALES ADVANTAGE".
JAKARTA:
PENERBIT ERLANGGA,
2012.
Text.