Autor:	Kelley, William J., Romualdi, Serafino, Fleming, R. W., Cushman, Edward L., Fox, Pauline W., Stessin, Lawrence, Coit, Eleanor G., McCallister, Frank, Porter,, Arthur R., Hoyt, Donald E., Witte, Edwin E., Griffin, J. F., Pearce,, John J., Stein, Emanuel
Zdroj:	Industrial and Labor Relations Review, 1951 Jul 01. 4(4), 627-638.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/2518528 Zobrazit plný text záznamu