Agapay, R. B. (1991). Logic: The essentials of deductive reasoning. National Book Store.
Citazione stile Chigago Style (17a edizione)Agapay, Ramon B. Logic: The Essentials of Deductive Reasoning. Metro Manila: National Book Store, 1991.
Citatione MLA (9a ed.)Agapay, Ramon B. Logic: The Essentials of Deductive Reasoning. National Book Store, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.