For All the Saints
- Very brief notice on St. Symphorosa and companions (i.e., her sons).
- http://www.saintpatrickdc.org/ss/0718.htm#symp

Catholic Encyclopedia
- St. Symphorosa, martyr, d. circa 138. According to legend, her seven sons were martyred with her, and her acts were extant in the fifth century, but today we have no reliable testimonies about her life and martyrdom.
- http://www.newadvent.org/cathen/14379a.htm