Gregory, o. N., & Callahan, V. W. (1999). Ascetical works. Catholic University of America Press.
Dyfyniad Arddull ChicagoGregory, of Nyssa, and Virginia Woods Callahan. Ascetical Works. Washington, D.C.: Catholic University of America Press, 1999.
Dyfyniad MLAGregory, of Nyssa, and Virginia Woods Callahan. Ascetical Works. Catholic University of America Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.