Coba jelasin Bibliografi dari Paus Sistus I dong

Benedict XVI. The Roman Martyrology. Gardners Books, 2007. .

Chapman, John. Studies on the Early Papacy. Port Washington, NY: Kennikat Press, 1971. .

Fortescue, Adrian, and Scott M. P. Reid. The Early Papacy: To the Synod of Chalcedon in 451. Southampton: Saint Austin Press, 1997. .

Jowett, George F. The Drama of the Lost Disciples. London: Covenant Pub. Co, 1968.

Loomis, Louise Ropes. The Book of Popes (Liber Pontificalis). Merchantville, NJ: Evolution Publishing. .