APA aipamena

Potten, H., & Potten, J. (2001). Clockwise: Elementary classbook. Oxford: Oxford University Press.

Chicago Style aipamena

Potten, Heather, và Jonathan Potten. Clockwise: Elementary Classbook. Oxford: Oxford University Press, 2001.

MLA aipamena

Potten, Heather, và Jonathan Potten. Clockwise: Elementary Classbook. Oxford: Oxford University Press, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.