Autor:	Goodlander, Mabel Ray, Gladding, Bessie A., Rutland, Robert A., Cohn, Sigmund A., Abernethy, Margaret A., Abramowitz, Alan A., Blumenthal, Henry, Anderson, Marion A., Stanley, John, Mason, Howard S., Anderson, Louise A., Wertz, Dorothy, (Corbett), Ball, Margaret R.
Zdroj:	The Elementary School Teacher, 1908 Oct 01. 9(2), 65-69.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/992749 Zobrazit plný text záznamu