Gaya APA
Developing business contacts. (1993).
tempaterbit:
penerbit.
Gaya Chicago
Developing business contacts.
Edisi.
tempaterbit:
penerbit,
1993.
Text.
Gaya MLA
Developing business contacts.
Edisi.
tempaterbit:
penerbit,
1993.
Text.
Gaya Turabian
Developing business contacts.
tempaterbit:
penerbit,
1993.
Print.