Dyfyniad APA

Freitag, H. T., & Freitag, A. H. (1960). The number story. National Council of Teachers of Mathematics.

Dyfyniad Arddull Chicago

Freitag, Herta Taussig, and Arthur H. Freitag. The Number Story. Washington: National Council of Teachers of Mathematics, 1960.

Dyfyniad MLA

Freitag, Herta Taussig, and Arthur H. Freitag. The Number Story. National Council of Teachers of Mathematics, 1960.

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