Sidgwick, H. (1897). The elements of politics (2d ed.). Macmillan.
Lua i Stíl Chicago (17ú heag.)Sidgwick, Henry. The Elements of Politics. 2d ed. London, New York: Macmillan, 1897.
Lua MLA (8ú heag.)Sidgwick, Henry. The Elements of Politics. 2d ed. Macmillan, 1897.
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