Gaya APA
Azar, B, S., Johnston, J.
(1998).
Understanding and using english grammar
(
1)
.
New York:
Pearson Longman.
Gaya MLA
Azar, Betty, Schramfer., Johnston, Janet.
"Understanding and using english grammar".
1
New York:
Pearson Longman,
1998.
Text.