Scott L. Lyn & Scott D. David. (2011). Natural English. Upper-intermediate: Workbook with key. New York, Oxford University Press, 2011.
Čikaški stil citiranja (17. izdanje)Scott L. Lyn i Scott D. David. Natural English. Upper-intermediate: Workbook with Key. New York, Oxford University Press, 2011, 2011.
MLA način citiranja (9. izdanje)Scott L. Lyn i Scott D. David. Natural English. Upper-intermediate: Workbook with Key. New York, Oxford University Press, 2011, 2011.
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