APA

O'Driscoll N., Pilbeam A., . (2003). Big City Level 2. New York: Oxford University Press.

Chicago

O'Driscoll N, Pilbeam A, . 2003. Big City Level 2. New York: Oxford University Press.

Harvard

O'Driscoll N., Pilbeam A., . (2003). Big City Level 2. New York: Oxford University Press.

MLA

O'Driscoll N, Pilbeam A, . Big City Level 2. New York: Oxford University Press. 2003.