Gaya APA
Essential english usage and grammar 4. (1991).
Jakarta:
Binarupa Aksara.
Gaya Chicago
Essential english usage and grammar 4.
.
Jakarta:
Binarupa Aksara,
1991.
Text.
Gaya MLA
Essential english usage and grammar 4.
.
Jakarta:
Binarupa Aksara,
1991.
Text.
Gaya Turabian
Essential english usage and grammar 4.
Jakarta:
Binarupa Aksara,
1991.
Print.