- Nicholas I, Pope - Biography of Pope St. Nicholas I, also called Nicholas the Great.
users.erols.com/saintpat/ss/1113.htm#nich
- Nicholas I, Saint, Pope - Short biographical entry in the Columbia Encyclopedia, 6th ed.
www.bartleby.com/65/ni/Nichls1.html
- Pope St. Nicholas I - Biography of this pope, d. 867, who upheld the authority of the papacy and the inviolability of marriage. In the Catholic Encyclopedia.
www.newadvent.org/cathen/11054a.htm
- St. Nicholas I, the Great - Profile of this pope.
www.cfpeople.org/Books/Pope/POPEp106.htm
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