Walling, W. E. (1912). A survey of the world-wide revolutionary movement. New York: The MacMillan Company.
Chicago-referens (17:e uppl.)Walling, William English. A Survey of the World-wide Revolutionary Movement. New York: The MacMillan Company, 1912.
MLA-referens (8:e uppl.)Walling, William English. A Survey of the World-wide Revolutionary Movement. New York: The MacMillan Company, 1912.
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