Autor:	Sigman, David, Tolles, N. Arnold, Widder,, Theodore C., Harbison, Frederick H., Coit, Eleanor G., Kuh, Clifford, Jehring, J. James, Everett, Albert E., Cutler, T. H.
Zdroj:	Industrial and Labor Relations Review, 1949 Jan 01. 2(2), 302-316.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/2519224 Zobrazit plný text záznamu