Não informado. (1994). Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Mathematics Teaching in the Middle School. Reston, Va: National Council of Teachers of Mathematics, 1994.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics, 1994.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.