Dubicka, I., & Iwonna Dubicka; Margaret O'Keeffe. (2011). Market leader: Advanced business English course book. Harlow: Pearson Longman,Financial Times.
Chicago Style aipamenaDubicka, Iwonna, và Iwonna Dubicka; Margaret O'Keeffe. Market Leader: Advanced Business English Course Book. Harlow: Pearson Longman,Financial Times, 2011.
MLA aipamenaDubicka, Iwonna, và Iwonna Dubicka; Margaret O'Keeffe. Market Leader: Advanced Business English Course Book. Harlow: Pearson Longman,Financial Times, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.