Gaya APA

Dubicka, I., O'Keeffe, M. (2006). MARKET LEADER: Advanced Intermediate Business English Course Book (1st Edition). England: Pearson Education Ltd..

Gaya MLA

Dubicka, Iwonna., O'Keeffe, Margaret. "MARKET LEADER: Advanced Intermediate Business English Course Book". 1st Edition England: Pearson Education Ltd., 2006. Text.