Cita APA (7a ed.)

Richards, J. (1979). The popes and the papacy in the early Middle Ages, 476-752. Routledge & Kegan Paul.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

Richards, Jeffrey. The Popes and the Papacy in the Early Middle Ages, 476-752. Routledge & Kegan Paul, 1979.