Gaya APA
Humphries, John. (1999).
Groiler Business Library : How to manage sales team .
Hongkong:
Grolier International.
Gaya Chicago
Humphries, John.
Groiler Business Library : How to manage sales team.
Hongkong:
Grolier International,
1999.
Text.
Gaya MLA
Humphries, John.
Groiler Business Library : How to manage sales team.
Hongkong:
Grolier International,
1999.
Text.
Gaya Turabian
Humphries, John.
Groiler Business Library : How to manage sales team.
Hongkong:
Grolier International,
1999.
Print.