Gaya APA
LANGAN, John. (2006).
English skills (8 th. ed.).
New York:
McGraw-Hill.
Gaya Chicago
LANGAN, John.
English skills.
8 th. ed.
New York:
McGraw-Hill,
2006.
Textbook.
Gaya MLA
LANGAN, John.
English skills.
8 th. ed.
New York:
McGraw-Hill,
2006.
Textbook.
Gaya Turabian
LANGAN, John.
English skills.
8 th. ed.
New York:
McGraw-Hill,
2006.
Textbook.