Agapay, R. B. (1991). Logic: The essentials of deductive reasoning. National Book Store.
Cita Chicago Style (17a ed.)Agapay, Ramon B. Logic: The Essentials of Deductive Reasoning. Metro Manila: National Book Store, 1991.
Cita MLA (9a ed.)Agapay, Ramon B. Logic: The Essentials of Deductive Reasoning. National Book Store, 1991.
Precaución: Estas citas no son 100% exactas.