Leypoldt, M. M. (1971). Learning is change. Judson Press.
Dyfyniad Arddull ChicagoLeypoldt, Martha M. Learning Is Change. Valley Forge, Pa.: Judson Press, 1971.
Dyfyniad MLALeypoldt, Martha M. Learning Is Change. Judson Press, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.