Ginsburg, H. (1977). Children's arithmetic: The learning process. D van Nostrand.
Dyfyniad Arddull ChicagoGinsburg, Herbert. Children's Arithmetic: The Learning Process. New York: D van Nostrand, 1977.
Dyfyniad MLAGinsburg, Herbert. Children's Arithmetic: The Learning Process. D van Nostrand, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.