Agapay, R. B. (1991). Logic: The essentials of deductive reasoning. National Book Store.
Citace podle Chicago (17th ed.)Agapay, Ramon B. Logic: The Essentials of Deductive Reasoning. Metro Manila: National Book Store, 1991.
Citace podle MLA (9th ed.)Agapay, Ramon B. Logic: The Essentials of Deductive Reasoning. National Book Store, 1991.
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