APA Style
Excellence in Business Communications. (1991).
Indonesia:
Elex Media Komputindo.
Chicago Style
Excellence in Business Communications.
1st edition.
Indonesia:
Elex Media Komputindo,
1991.
Text.
MLA Style
Excellence in Business Communications.
1st edition.
Indonesia:
Elex Media Komputindo,
1991.
Text.
Turabian Style
Excellence in Business Communications.
Indonesia:
Elex Media Komputindo,
1991.
Print.