APA Style
Longman English Course Book IB. (1981).
Indonesia:
Elex Media Komputindo.
Chicago Style
Longman English Course Book IB.
1st edition.
Indonesia:
Elex Media Komputindo,
1981.
Text.
MLA Style
Longman English Course Book IB.
1st edition.
Indonesia:
Elex Media Komputindo,
1981.
Text.
Turabian Style
Longman English Course Book IB.
Indonesia:
Elex Media Komputindo,
1981.
Print.