APA aipamena

Ireland, S. (2010). PET Direct Workbook with Answers. Cambridge University Press.

Chicago Style aipamena

Ireland, Sue. PET Direct Workbook With Answers. Cambridge University Press, 2010.

MLA aipamena

Ireland, Sue. PET Direct Workbook With Answers. Cambridge University Press, 2010.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.