Gaya APA
Longman english course book 1A. (1977).
tempaterbit:
penerbit.
Gaya Chicago
Longman english course book 1A.
Edisi.
tempaterbit:
penerbit,
1977.
Text.
Gaya MLA
Longman english course book 1A.
Edisi.
tempaterbit:
penerbit,
1977.
Text.
Gaya Turabian
Longman english course book 1A.
tempaterbit:
penerbit,
1977.
Print.