APA-viite (7. p.)

Scott L. Lyn & Scott D. David. (2003). Natural English. Upper-intermediate: Workbook with key (2nd ed.). New York, Oxford University Press, 2003.

Chicago-viite (17. p.)

Scott L. Lyn ja Scott D. David. Natural English. Upper-intermediate: Workbook with Key. 2nd ed. New York, Oxford University Press, 2003, 2003.

MLA-viite (9. p.)

Scott L. Lyn ja Scott D. David. Natural English. Upper-intermediate: Workbook with Key. 2nd ed. New York, Oxford University Press, 2003, 2003.