Gaya APA
Oxford progressive english coursebook 1. (1973).
tempaterbit:
penerbit.
Gaya Chicago
Oxford progressive english coursebook 1.
Edisi.
tempaterbit:
penerbit,
1973.
Text.
Gaya MLA
Oxford progressive english coursebook 1.
Edisi.
tempaterbit:
penerbit,
1973.
Text.
Gaya Turabian
Oxford progressive english coursebook 1.
tempaterbit:
penerbit,
1973.
Print.