Lillard, P. P. (1972). Montessori, a modern approach. Schocken Books.
Dyfyniad Arddull ChicagoLillard, Paula Polk. Montessori, a Modern Approach. New York: Schocken Books, 1972.
Dyfyniad MLALillard, Paula Polk. Montessori, a Modern Approach. Schocken Books, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.