Wolff Douglas, D. (1925). Guillaume De Greef: The social theory of an early syndicalist. New York: Columbia University.
Chicago Style aipamenaWolff Douglas, Dorothy. Guillaume De Greef: The Social Theory of an Early Syndicalist. New York: Columbia University, 1925.
MLA aipamenaWolff Douglas, Dorothy. Guillaume De Greef: The Social Theory of an Early Syndicalist. New York: Columbia University, 1925.
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