APA (7th ed.) Citation

Leonard, H. S. (1967). Principles of reasoning: An introduction to: logic, methodology, and the theory of signs. Dover Publ.

Chicago Style (17th ed.) Citation

Leonard, Henry S. Principles of Reasoning: An Introduction to: Logic, Methodology, and the Theory of Signs. New York: Dover Publ, 1967.

MLA (9th ed.) Citation

Leonard, Henry S. Principles of Reasoning: An Introduction to: Logic, Methodology, and the Theory of Signs. Dover Publ, 1967.