Gaya APA
Longman english course book 2A. (1970).
tempaterbit:
penerbit.
Gaya Chicago
Longman english course book 2A.
Edisi.
tempaterbit:
penerbit,
1970.
Text.
Gaya MLA
Longman english course book 2A.
Edisi.
tempaterbit:
penerbit,
1970.
Text.
Gaya Turabian
Longman english course book 2A.
tempaterbit:
penerbit,
1970.
Print.