Kramer, K. (1970). Teaching elementary school mathematics (2nd ed.). Allyn and Bacon.
Dyfyniad Arddull ChicagoKramer, Klaas. Teaching Elementary School Mathematics. 2nd ed. Boston: Allyn and Bacon, 1970.
Dyfyniad MLAKramer, Klaas. Teaching Elementary School Mathematics. 2nd ed. Allyn and Bacon, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.