Ketton-Cremer, R. Thomas Gray: A biography. Cambridge University Press.
Chicago Style aipamenaKetton-Cremer, R.W. Thomas Gray: A Biography. London: Cambridge University Press.
MLA aipamenaKetton-Cremer, R.W. Thomas Gray: A Biography. Cambridge University Press.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.