National Council of Teachers of Mathematics. Arithmetic teacher & NCTM news bulletin. National Council of Teachers of Mathematics.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Council of Teachers of Mathematics. Arithmetic Teacher & NCTM News Bulletin. Reston, VA [etc.]: National Council of Teachers of Mathematics.
Παραπομπή σε μορφή MLA (8th εκδ.)National Council of Teachers of Mathematics. Arithmetic Teacher & NCTM News Bulletin. National Council of Teachers of Mathematics.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.
