Gaya APA
Practical business corespondence. (1997).
Jakarta:
Kesaint Blanc.
Gaya Chicago
Practical business corespondence.
.
Jakarta:
Kesaint Blanc,
1997.
Text.
Gaya MLA
Practical business corespondence.
.
Jakarta:
Kesaint Blanc,
1997.
Text.
Gaya Turabian
Practical business corespondence.
Jakarta:
Kesaint Blanc,
1997.
Print.