For All the Saints
- Short article.
- http://www.saintpatrickdc.org/ss/1126.htm#siri

The Ecole Glossary
- Pope St. Siricius was apparently the first to issue decretals.
- http://www2.evansville.edu/ecoleweb/glossary/siricius.html

Catholic Encyclopedia
- Pope, d. 399. St. Siricius condemned Jovinian, but this did not spare the pope from criticism by St. Jerome.
- http://www.newadvent.org/cathen/14026a.htm

Popes Through the Ages
- Account of the pontificate of St. Siricius, from the book by Joseph Brusher.
- http://www.cfpeople.org/Books/Pope/POPEp38.htm