Papal Encyclicals Online
- Archive of encyclicals and other papal documents. Fairly complete from Pope Gregory XVI (1831-1846) to the present; some documents from earlier popes, as far back as Honorius III in 1227.
- http://www.papalencyclicals.net/

Popes of the Roman Catholic Church
- A table from The Columbia Encyclopedia, 6th ed., in chronological order. Some entries linked to biographical articles.
- http://www.bartleby.com/65/po/popesTABLE.html

Popes Through the Ages
- By Joseph Brusher. Papal lineage table, and brief accounts of the pontificates of every bishop of Rome from St. Peter the Apostle to the present.
- http://www.cfpeople.org/Books/Pope/CFPtoc.htm

The List of Popes
- In chronological order. Links to a biographical essay on each pontiff up through Pope St. Pius X (d. 1914), from the 1913 Catholic Encyclopedia.
- http://www.newadvent.org/cathen/12272b.htm