Gaya APA
Business Communications. (1984).
Boston:
Kent Publishing Company..
Gaya Chicago
Business Communications.
Ed. 7.
Boston:
Kent Publishing Company.,
1984.
.
Gaya MLA
Business Communications.
Ed. 7.
Boston:
Kent Publishing Company.,
1984.
.
Gaya Turabian
Business Communications.
Boston:
Kent Publishing Company.,
1984.
.