Devas, C. S. (1906). The key to the world's progress, being an essay on historical logic. Longmans, Green and Co..
Citace podle Chicago (17th ed.)Devas, Charles Stanton. The Key to the World's Progress, Being an Essay on Historical Logic. London: Longmans, Green and Co., 1906.
Citace podle MLA (8th ed.)Devas, Charles Stanton. The Key to the World's Progress, Being an Essay on Historical Logic. Longmans, Green and Co., 1906.
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