Baker, L. (1995). Primary mathematics with Polydron TM: Explore, create, understand. Northampton: Polydron International.
Dyfyniad Arddull ChicagoBaker, Lyndon. Primary Mathematics With Polydron TM: Explore, Create, Understand. Northampton: Polydron International, 1995.
Dyfyniad MLABaker, Lyndon. Primary Mathematics With Polydron TM: Explore, Create, Understand. Northampton: Polydron International, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.