Newman, C. M. (2003). Contemporary english (Second edition.). USA: McGraw-Hill.
Chicago Style aipamenaNewman, Christy M. Contemporary English. Second edition. USA: McGraw-Hill, 2003.
MLA aipamenaNewman, Christy M. Contemporary English. Second edition. USA: McGraw-Hill, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.