Não informado. (1994). Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics.
Chicago-referens (17:e uppl.)Não informado. Mathematics Teaching in the Middle School. Reston, Va: National Council of Teachers of Mathematics, 1994.
MLA-referens (8:e uppl.)Não informado. Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.