Autor:	Needler, Martin C., Duff, Ernest A., McCamant, John F., Gibson, Frank K., Prather, James E., Shapiro, Michael J., Dye, Thomas R., Dyson, James W., Pulsipher, Allan G., Weatherby,, James L., Codding,, George A., Barber, Benjamin R.
Zdroj:	The American Political Science Review, 1969 Jun 01. 63(2), 526-530.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1954706 Zobrazit plný text záznamu