Gaya APA
BALLIN, W.H.. (1990).
Perfect Your English: the easy way .
Amerika:
Prentice Hall International.
Gaya Chicago
BALLIN, W.H..
Perfect Your English: the easy way.
Amerika:
Prentice Hall International,
1990.
Text.
Gaya MLA
BALLIN, W.H..
Perfect Your English: the easy way.
Amerika:
Prentice Hall International,
1990.
Text.
Gaya Turabian
BALLIN, W.H..
Perfect Your English: the easy way.
Amerika:
Prentice Hall International,
1990.
Print.