Puchta, H., Stranks, J., & Jones, P. L. (2018). Think A1: Student's book starter. New York: Cambridge University Press.
Chicago Style aipamenaPuchta, Herbert, Jeff Stranks, và Peter Lewis Jones. Think A1: Student's Book Starter. New York: Cambridge University Press, 2018.
MLA aipamenaPuchta, Herbert, Jeff Stranks, và Peter Lewis Jones. Think A1: Student's Book Starter. New York: Cambridge University Press, 2018.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.