Gaya APA
Hughes, R., Heah, C. (1999).
Common errors in english : grammar exercises for malaysians (2nd edition).
Shah Alam:
Fajar Bakti.
Gaya MLA
Hughes, Richard., Heah, Carmel.
"Common errors in english : grammar exercises for malaysians".
2nd edition
Shah Alam:
Fajar Bakti,
1999.
BUKU.