APA

Dubicka I., O'keeffe M., . (2006). Advanced business English : Course book. London: Pearson education.

Chicago

Dubicka Iwonna, O'keeffe Margaret, . 2006. Advanced business English : Course book. London: Pearson education.

Harvard

Dubicka I., O'keeffe M., . (2006). Advanced business English : Course book. London: Pearson education.

MLA

Dubicka Iwonna, O'keeffe Margaret, . Advanced business English : Course book. London: Pearson education. 2006.