Gaya APA
Helgesen, M. et al (1991).
New English Firsthand: Expanding Communicative Language Skills Teacher's Manual .
Hong Kong:
Lingual House.
Gaya MLA
Helgesen, Marc. et al.
"New English Firsthand: Expanding Communicative Language Skills Teacher's Manual".
Hong Kong:
Lingual House,
1991.
Book.