Gaya APA

Abraham, P., Mackey, D. (1997). Contact USA : a reading and vocabulary text (3rd ed). Upper Saddle River, NJ: Prentice Hall Regents.

Gaya MLA

Abraham, Paul., Mackey, Daphine. "Contact USA : a reading and vocabulary text". 3rd ed Upper Saddle River, NJ: Prentice Hall Regents, 1997. Text.