Gaya APA
Murphy, R. (1998).
Essential Grammar in use: a self-study refernce an practice book for elementary students of english with answer (second edition).
United States:
Cambridge University Press.
Gaya MLA
Murphy, Raymond.
"Essential Grammar in use: a self-study refernce an practice book for elementary students of english with answer".
second edition
United States:
Cambridge University Press,
1998.
Text.