Gaya APA
Student ekercise series. (2007).
Jakarta:
Gramedia.
Gaya Chicago
Student ekercise series.
.
Jakarta:
Gramedia,
2007.
.
Gaya MLA
Student ekercise series.
.
Jakarta:
Gramedia,
2007.
.
Gaya Turabian
Student ekercise series.
Jakarta:
Gramedia,
2007.
.