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Dyfyniad Arddull Chicagoel koussy, a.a. Preconditions for Educational Planning. cairo: the institute of national planning, 1964.
Dyfyniad MLAel koussy, a.a. Preconditions for Educational Planning. the institute of national planning, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.