Beer, S. H., Ulam, A. B., Berger, S., & Goldman, G. (1958). Patterns of Government: The major political systems of Europe (3rd ed.). Random House.
Chicago-tyylinen lähdeviittausBeer, Samuel H., Adam B. Ulam, Suzanne Berger, ja Guido Goldman. Patterns of Government: The Major Political Systems of Europe. 3rd ed. New York: Random House, 1958.
MLA-viiteBeer, Samuel H., et al. Patterns of Government: The Major Political Systems of Europe. 3rd ed. Random House, 1958.
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