Gaya APA

Byrd, P., Beverly, I, B. (1994). Problem solution a reference for esl writers . New: New York: Heinle & Heinle, 1994.

Gaya MLA

Byrd, Patricia., Beverly, I., Benson,. "Problem solution a reference for esl writers". New: New York: Heinle & Heinle, 1994, 1994. Text.