Durant Will. (1961). The age of reason begins. New York: Simon and Schuster.
Dyfyniad Arddull ChicagoDurant Will. The Age of Reason Begins. New York: Simon and Schuster, 1961.
Dyfyniad MLADurant Will. The Age of Reason Begins. New York: Simon and Schuster, 1961.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.