Waelder, R. (1967). Progress and revolution: A study of the issues of our age. International Universities Press.
Citace podle Chicago (17th ed.)Waelder, Robert. Progress and Revolution: A Study of the Issues of Our Age. New York: International Universities Press, 1967.
Citace podle MLA (9th ed.)Waelder, Robert. Progress and Revolution: A Study of the Issues of Our Age. International Universities Press, 1967.
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