Não informado. (1980). For the Learning of Mathematics. FLM Publishing Association.
Chicago-referens (17:e uppl.)Não informado. For the Learning of Mathematics. Montreal, Canada: FLM Publishing Association, 1980.
MLA-referens (8:e uppl.)Não informado. For the Learning of Mathematics. FLM Publishing Association, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.