Gaya APA
Abraham, P., Mackey, D.
(2005).
CONTACT USA 1 READING AND VOCABULARY
.
America:
Longman Group Limited.
Gaya MLA
Abraham, Paul., Mackey, Daphne.
"CONTACT USA 1 READING AND VOCABULARY".
America:
Longman Group Limited,
2005.
Referencec.