Gaya APA
Modern business correspondence. (1989).
Jakarta:
Binarupa Aksara.
Gaya Chicago
Modern business correspondence.
.
Jakarta:
Binarupa Aksara,
1989.
Text.
Gaya MLA
Modern business correspondence.
.
Jakarta:
Binarupa Aksara,
1989.
Text.
Gaya Turabian
Modern business correspondence.
Jakarta:
Binarupa Aksara,
1989.
Print.