Gaya APA
Step by step to speak english. (2006).
Jakarta:
putra nugraha.
Gaya Chicago
Step by step to speak english.
cet. 1.
Jakarta:
putra nugraha,
2006.
.
Gaya MLA
Step by step to speak english.
cet. 1.
Jakarta:
putra nugraha,
2006.
.
Gaya Turabian
Step by step to speak english.
Jakarta:
putra nugraha,
2006.
.