Gaya APA
Humphries, J. (2003).
Grolier Business Library: How to Manage a Sales Team (Deluxe Edition).
Hongkong:
Grolier International Inc..
Gaya MLA
Humphries, John.
"Grolier Business Library: How to Manage a Sales Team".
Deluxe Edition
Hongkong:
Grolier International Inc.,
2003.
Texts.