Autor:	Cassati, Chris, Brookins, Gary, Reeves, Andy, Smith, Stephen P., House, Peggy, Weller, Kristin M., Kenyon, Glenn, Haner, Pamela
Zdroj:	Mathematics Teaching in the Middle School, 2009 Feb 01. 14(6), 354-356.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/41182696 Zobrazit plný text záznamu