Puchta, H., Stranks, J., & Jones, P. L. (2018). Think C1: Workbook 5. New York: Cambridge University Press.
Chicago Style aipamenaPuchta, Herbert, Jeff Stranks, và Peter Lewis Jones. Think C1: Workbook 5. New York: Cambridge University Press, 2018.
MLA aipamenaPuchta, Herbert, Jeff Stranks, và Peter Lewis Jones. Think C1: Workbook 5. New York: Cambridge University Press, 2018.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.