Cita APA (7a ed.)

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.