National Council of Teachers of Mathematics. (2020). Mathematics News Letter. Mathematics News Letter.
Chicago-referens (17:e uppl.)National Council of Teachers of Mathematics. Mathematics News Letter. Baton Rouge, La: Mathematics News Letter, 2020.
MLA-referens (8:e uppl.)National Council of Teachers of Mathematics. Mathematics News Letter. Mathematics News Letter, 2020.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.