Freeland, G. E. (1939). Learning activities with self-testing exercises for America and the new frontier. C. Scribner's Sons.
Dyfyniad Arddull ChicagoFreeland, George Earl. Learning Activities with Self-testing Exercises for America and the New Frontier. New York: C. Scribner's Sons, 1939.
Dyfyniad MLAFreeland, George Earl. Learning Activities with Self-testing Exercises for America and the New Frontier. C. Scribner's Sons, 1939.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.