Peter Damian, S., Blum, O. J., & Resnick, I. M. (2005). Peter Damian: Letters. Catholic University of America Press.
Dyfyniad Arddull ChicagoPeter Damian, Saint, Owen J. Blum, and Irven Michael Resnick. Peter Damian: Letters. Washington, D.C.: Catholic University of America Press, 2005.
Dyfyniad MLAPeter Damian, Saint, et al. Peter Damian: Letters. Catholic University of America Press, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.