Gaya APA
Business Communication. (1984).
California:
Kent publishing company.
Gaya Chicago
Business Communication.
Ed. 7.
California:
Kent publishing company,
1984.
.
Gaya MLA
Business Communication.
Ed. 7.
California:
Kent publishing company,
1984.
.
Gaya Turabian
Business Communication.
California:
Kent publishing company,
1984.
.