Crystal, D. e. (2000). The Cambridge factfinder. Cambridge University Press.
Chicago Style aipamenaCrystal, David ed. The Cambridge Factfinder. Cambridge, UK: Cambridge University Press, 2000.
MLA aipamenaCrystal, David ed. The Cambridge Factfinder. Cambridge University Press, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.