Cita APA

Richards, J. 1. (1979). The popes and the papacy in the early Middle Ages, 476-752. London [etc.]: Routledge & Kegan Paul.

Citación estilo Chicago

Richards, Jeffrey 1945-. The Popes and the Papacy in the Early Middle Ages, 476-752. London [etc.]: Routledge & Kegan Paul, 1979.

Cita MLA

Richards, Jeffrey 1945-. The Popes and the Papacy in the Early Middle Ages, 476-752. London [etc.]: Routledge & Kegan Paul, 1979.