Gaya APA
Look Ahead : An English Course. (2008).
Jakarta:
Erlangga.
Gaya Chicago
Look Ahead : An English Course.
.
Jakarta:
Erlangga,
2008.
Text.
Gaya MLA
Look Ahead : An English Course.
.
Jakarta:
Erlangga,
2008.
Text.
Gaya Turabian
Look Ahead : An English Course.
Jakarta:
Erlangga,
2008.
Print.