Dyfyniad APA

Morton, R. L. (1937). Teaching arithmetic in elementary school. Silver Burdett company.

Dyfyniad Arddull Chicago

Morton, Robert Lee. Teaching Arithmetic in Elementary School. New York, boston [etc.]: Silver Burdett company, 1937.

Dyfyniad MLA

Morton, Robert Lee. Teaching Arithmetic in Elementary School. Silver Burdett company, 1937.

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