Gaya APA
Longman effective guide to O level english. (2007).
tempaterbit:
penerbit.
Gaya Chicago
Longman effective guide to O level english.
Edisi.
tempaterbit:
penerbit,
2007.
Text.
Gaya MLA
Longman effective guide to O level english.
Edisi.
tempaterbit:
penerbit,
2007.
Text.
Gaya Turabian
Longman effective guide to O level english.
tempaterbit:
penerbit,
2007.
Print.