Gaya APA
Handbook of business letters. (2004).
Jakarta:
Bhuana Ilmu Populer.
Gaya Chicago
Handbook of business letters.
.
Jakarta:
Bhuana Ilmu Populer,
2004.
Text.
Gaya MLA
Handbook of business letters.
.
Jakarta:
Bhuana Ilmu Populer,
2004.
Text.
Gaya Turabian
Handbook of business letters.
Jakarta:
Bhuana Ilmu Populer,
2004.
Print.