Autor:	GULICK, LUTHER H., FELLOWS, GEORGE E., LANDERS, J. S., BINGHAM, R., KENNEDY, JOSEPH, HERRON, SCHUYLER F., HOUSH, W. H., BARRETT, H. M., COOK, JOE, WHITNEY, E. R., BIRCH, ROBERT S., PADDOCK, MINER H.
Zdroj:	The Journal of Education, 1915 Sep . 8211 (2047), 283-300.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/42824464 Zobrazit plný text záznamu