Richards, J. 1. (1979). The popes and the papacy in the early Middle Ages, 476-752. London [etc.]: Routledge & Kegan Paul.
Citación estilo ChicagoRichards, Jeffrey 1945-. The Popes and the Papacy in the Early Middle Ages, 476-752. London [etc.]: Routledge & Kegan Paul, 1979.
Cita MLARichards, Jeffrey 1945-. The Popes and the Papacy in the Early Middle Ages, 476-752. London [etc.]: Routledge & Kegan Paul, 1979.
Precaución: Estas citas no son 100% exactas.