Julius I, Pope
- Biography of the saint.
- http://www.saintpatrickdc.org/ss/0412.htm#juli

Julius I
- Brief account of the pontificate of Pope St. Julius I, by Karen Rae Keck.
- http://www2.evansville.edu/ecoleweb/glossary/juliusr.html

Julius I, Saint
- Brief biographical article in the Columbia Encyclopedia, 6th ed.
- http://www.bartleby.com/65/ju/JuliusI.html

St. Julius I
- Brief biography, from "Popes Through the Ages" by Joseph Brusher.
- http://www.cfpeople.org/Books/Pope/POPEp35.htm

Pope St. Julius I
- A Roman, anti-Arian, supporter of St. Athanasius. Julius died in 352. Biographical article in the Catholic Encyclopedia.
- http://www.newadvent.org/cathen/08561a.htm