APA Style
Penguin english tests. Book 3. (1989).
Jakarta:
Gelatik.
Chicago Style
Penguin english tests. Book 3.
.
Jakarta:
Gelatik,
1989.
.
MLA Style
Penguin english tests. Book 3.
.
Jakarta:
Gelatik,
1989.
.
Turabian Style
Penguin english tests. Book 3.
Jakarta:
Gelatik,
1989.
.