| 1. 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/ |
| 2. 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 |
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| 3. 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 |
| 4. 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 |
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