Gabriel, R. H. (1956). The course of American democratic thought (2nd ed.). New York: Ronald Press.
Παραπομπή Chicago StyleGabriel, Ralph Henry. The Course of American Democratic Thought. 2nd ed. New York: Ronald Press, 1956.
Παραπομπή MLAGabriel, Ralph Henry. The Course of American Democratic Thought. 2nd ed. New York: Ronald Press, 1956.
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