Vietnamese Eucharistic Youth Society
- The stories of SS. Nereus and Achilleus, and St. Pancras. Suitable for children.
- http://www.tntt.org/vni/tlieu/saints/St0512.htm

Catholic Encyclopedia
- SS. Nereus and Achilleus, Domitilla and Pancratius, Roman martyrs who shared a feast day on 12 May. Nereus and Achilleus are martyrs of the first or early second century, and were buried in the Catacomb of Domitilla. Pancratius was martyred most likely in
- http://www.newadvent.org/cathen/10751a.htm