Soars, L., & Soars, J. (1996). New Headway English Course: Intermediate Workbook : with key (4th impression.). Oxford University Press.
Chicago-viite (17. p.)Soars, Liz, ja John Soars. New Headway English Course: Intermediate Workbook : With Key. 4th impression. Oxford: Oxford University Press, 1996.
MLA-viite (8. p.)Soars, Liz, ja John Soars. New Headway English Course: Intermediate Workbook : With Key. 4th impression. Oxford University Press, 1996.
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