Não informado. (1994). Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics.
Chicago-Zitierstil (17. Ausg.)Não informado. Mathematics Teaching in the Middle School. Reston, Va: National Council of Teachers of Mathematics, 1994.
MLA-Zitierstil (8. Ausg.)Não informado. Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics, 1994.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.