Gaya APA
Secondary english skills 9. (1992).
Jakarta:
Binarupa Aksara.
Gaya Chicago
Secondary english skills 9.
.
Jakarta:
Binarupa Aksara,
1992.
Text.
Gaya MLA
Secondary english skills 9.
.
Jakarta:
Binarupa Aksara,
1992.
Text.
Gaya Turabian
Secondary english skills 9.
Jakarta:
Binarupa Aksara,
1992.
Print.