Cita APA (7th ed.)

Castro, L. D. d. (1993). Ethics and logic: Basic concepts. Katha Pub.

Cita Chicago (17th ed.)

Castro, Leonardo D. de. Ethics and Logic: Basic Concepts. Quezon City: Katha Pub, 1993.

Cita MLA (9th ed.)

Castro, Leonardo D. de. Ethics and Logic: Basic Concepts. Katha Pub, 1993.