Gaya APA

VII, G. (-1969). The correspondence of Pope Gregory VII, selected letters from the Registrum. Transl. & introd. by Ephraim Emerton, repr. Copyright 1932. . New York: Norton.

Gaya MLA

VII, Gregorius. "The correspondence of Pope Gregory VII, selected letters from the Registrum. Transl. & introd. by Ephraim Emerton, repr. Copyright 1932. ". New York: Norton, -1969. Buku.