Dyfyniad APA

UNDERHILL, R. G. (1977). Teaching elementary school mathematics.-- ed.2. Charles E.Merill pub.

Dyfyniad Arddull Chicago

UNDERHILL, Robert G. Teaching Elementary School Mathematics.-- Ed.2. Columbus: Charles E.Merill pub, 1977.

Dyfyniad MLA

UNDERHILL, Robert G. Teaching Elementary School Mathematics.-- Ed.2. Charles E.Merill pub, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.