"What Are Numbers?" "Reading and Writing Whole Numbers," "Addition and Subtraction, Part I," "Addition and Subtraction, Part II," "Multiplication and Division," "Solving Problems,"

Autor:	McMahon, Della
Zdroj:	The Mathematics Teacher, 1958 May 01. 51(5), 386-387.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/27955695 Zobrazit plný text záznamu