APA (7e ed.) Bronvermelding

Scott L. Lyn & Scott D. David. (2005). Natural English. Pre-intermediate: Workbook with key. New York, Oxford University Press, 2005.

Chicago (17e ed.) Bronvermelding

Scott L. Lyn en Scott D. David. Natural English. Pre-intermediate: Workbook with Key. New York, Oxford University Press, 2005, 2005.

MLA (9e ed.) Bronvermelding

Scott L. Lyn en Scott D. David. Natural English. Pre-intermediate: Workbook with Key. New York, Oxford University Press, 2005, 2005.