Gaya APA
Guffey. (2006).
Business communication buku 1 (4).
Jakarta:
Salemba Empat.
Gaya Chicago
Guffey.
Business communication buku 1.
4
Jakarta:
Salemba Empat,
2006.
Text.
Gaya MLA
Guffey.
Business communication buku 1.
4
Jakarta:
Salemba Empat,
2006.
Text.
Gaya Turabian
Guffey.
Business communication buku 1.
4
Jakarta:
Salemba Empat,
2006.
Print.