(1970). A history of mathematics education in the United States and Canada. National Council of Teachers of Mathematics.
Chicago-Zitierstil (17. Ausg.)A History of Mathematics Education in the United States and Canada. Washington, D.C: National Council of Teachers of Mathematics, 1970.
MLA-Zitierstil (9. Ausg.)A History of Mathematics Education in the United States and Canada. National Council of Teachers of Mathematics, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.