Leonard, H. S. (1967). Principles of reasoning: An introduction to: logic, methodology and the theory of signs. Dover.
Citace podle Chicago (17th ed.)Leonard, Henry Siggins. Principles of Reasoning: An Introduction to: Logic, Methodology and the Theory of Signs. New York: Dover, 1967.
Citace podle MLA (8th ed.)Leonard, Henry Siggins. Principles of Reasoning: An Introduction to: Logic, Methodology and the Theory of Signs. Dover, 1967.
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