Gaya APA
Longman english course book 1b. (1976).
tempaterbit:
penerbit.
Gaya Chicago
Longman english course book 1b.
Edisi.
tempaterbit:
penerbit,
1976.
Text.
Gaya MLA
Longman english course book 1b.
Edisi.
tempaterbit:
penerbit,
1976.
Text.
Gaya Turabian
Longman english course book 1b.
tempaterbit:
penerbit,
1976.
Print.