A Study of the Possibilities of Graphs as a Means of Instruction in the First Four Grades of the Elementary School Ruth G. Strickland

Zdroj:	The Mathematics Teacher, 1939 May 01. 32(5), 238-238.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/27952309 Zobrazit plný text záznamu