Ireland, S. (2010). Pet direct: Student's book. Cambridge: Cambridge University Press.
Chicago Style aipamenaIreland, Sue. Pet Direct: Student's Book. Cambridge: Cambridge University Press, 2010.
MLA aipamenaIreland, Sue. Pet Direct: Student's Book. Cambridge: Cambridge University Press, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.