Paul Charles Bartholomew Papers. University of Notre Dame Archives.
Dyfyniad Arddull ChicagoPaul Charles Bartholomew Papers. University of Notre Dame Archives.
Dyfyniad MLAPaul Charles Bartholomew Papers. University of Notre Dame Archives.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.