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Dyfyniad Arddull ChicagoCornell, Thomas C., Monica Cornell, and Rosalie G. Riegle. Oral History Interview with Thomas Cornell and Monica Cornell. 1998.
Dyfyniad MLACornell, Thomas C., et al. Oral History Interview with Thomas Cornell and Monica Cornell. 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.