APA استشهاد

Ketton-Cremer, R. Thomas Gray: A biography. Cambridge University Press.

استشهاد بنمط شيكاغو

Ketton-Cremer, R.W. Thomas Gray: A Biography. London: Cambridge University Press.

MLA استشهاد

Ketton-Cremer, R.W. Thomas Gray: A Biography. Cambridge University Press.