Gaya APA
Basic commercial english. (1989).
Jakarta:
Binarupa Aksara.
Gaya Chicago
Basic commercial english.
.
Jakarta:
Binarupa Aksara,
1989.
Text.
Gaya MLA
Basic commercial english.
.
Jakarta:
Binarupa Aksara,
1989.
Text.
Gaya Turabian
Basic commercial english.
Jakarta:
Binarupa Aksara,
1989.
Print.