Radley, P. (2005). Horizons: Student's book 1. Oxford: Oxford University Press.
Chicago Style aipamenaRadley, Paul. Horizons: Student's Book 1. Oxford: Oxford University Press, 2005.
MLA aipamenaRadley, Paul. Horizons: Student's Book 1. Oxford: Oxford University Press, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.