Gaya APA
HARRIS, Michael .Dkk. (2003).
Opportunities Level 1 : students' book .
Malaysia:
Longman.
Gaya Chicago
HARRIS, Michael .Dkk.
Opportunities Level 1 : students' book.
Malaysia:
Longman,
2003.
Text.
Gaya MLA
HARRIS, Michael .Dkk.
Opportunities Level 1 : students' book.
Malaysia:
Longman,
2003.
Text.
Gaya Turabian
HARRIS, Michael .Dkk.
Opportunities Level 1 : students' book.
Malaysia:
Longman,
2003.
Print.