Citazione Stile APA (7a Edizione)

Scott L. Lyn & Scott D. David. (2010). Natural English. Pre-intermediate: Workbook with key. New York, Oxford University Press, 2010.

Citazione stile Chigago Style (17a edizione)

Scott L. Lyn e Scott D. David. Natural English. Pre-intermediate: Workbook with Key. New York, Oxford University Press, 2010, 2010.

Citatione MLA (9a ed.)

Scott L. Lyn e Scott D. David. Natural English. Pre-intermediate: Workbook with Key. New York, Oxford University Press, 2010, 2010.