APA

Dubicka I., O'Keeffe M., . (2008). Premium. B2 level. Harlow: Longman.

Chicago

Dubicka I, O'Keeffe M, . 2008. Premium. B2 level. Harlow: Longman.

Harvard

Dubicka I., O'Keeffe M., . (2008). Premium. B2 level. Harlow: Longman.

MLA

Dubicka I, O'Keeffe M, . Premium. B2 level. Harlow: Longman. 2008.