Potten, H., & Potten, J. (2001). Clockwise: Elementary classbook [Băng Casset]. Oxford: Oxford University Press.
Čikaški stil citiranjaPotten, Heather, i Jonathan Potten. Clockwise: Elementary Classbook [Băng Casset]. Oxford: Oxford University Press, 2001.
MLA način citiranjaPotten, Heather, i Jonathan Potten. Clockwise: Elementary Classbook [Băng Casset]. Oxford: Oxford University Press, 2001.
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