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Dyfyniad Arddull ChicagoKett, Joseph F. The Pursuit of Knowledge Under Difficulties: From Self Improvement to Adult Education in America,1750-1990. California: Stanford University Press, 1994.
Dyfyniad MLAKett, Joseph F. The Pursuit of Knowledge Under Difficulties: From Self Improvement to Adult Education in America,1750-1990. Stanford University Press, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.