Freudenthal, H. (1978). Change in mathematics education sicne the late 1950's: Ideas and realisation. D. Reidel.
Dyfyniad Arddull ChicagoFreudenthal, Hans. Change in Mathematics Education Sicne the Late 1950's: Ideas and Realisation. Dordrecht: D. Reidel, 1978.
Dyfyniad MLAFreudenthal, Hans. Change in Mathematics Education Sicne the Late 1950's: Ideas and Realisation. D. Reidel, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.