(1957). Insights into modern mathematics. Washington: The National Council of Teachers of Mathematics.
Dyfyniad Arddull ChicagoInsights Into Modern Mathematics. Washington: The National Council of Teachers of Mathematics, 1957.
Dyfyniad MLAInsights Into Modern Mathematics. Washington: The National Council of Teachers of Mathematics, 1957.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.