Gaya APA
Kingsbury, Roy, Wellman, Guy. (1987).
Longman advanced English : coursebook (4th ed).
Hong Kong:
Longman.
Gaya Chicago
Kingsbury, Roy, Wellman, Guy.
Longman advanced English : coursebook.
4th ed
Hong Kong:
Longman,
1987.
Text.
Gaya MLA
Kingsbury, Roy, Wellman, Guy.
Longman advanced English : coursebook.
4th ed
Hong Kong:
Longman,
1987.
Text.
Gaya Turabian
Kingsbury, Roy, Wellman, Guy.
Longman advanced English : coursebook.
4th ed
Hong Kong:
Longman,
1987.
Print.