Gaya APA
Business english American style. (2003).
Bandung:
Yrama Widya.
Gaya Chicago
Business english American style.
.
Bandung:
Yrama Widya,
2003.
Text.
Gaya MLA
Business english American style.
.
Bandung:
Yrama Widya,
2003.
Text.
Gaya Turabian
Business english American style.
Bandung:
Yrama Widya,
2003.
Print.