Cita APA (7th ed.)
Alvira, T., Clavell, L., Melendo, T., & Supan, L. (1991). Metaphysics. Sinag-tala Publishers.
Cita Chicago (17th ed.)
Alvira, Tomás, Luis Clavell, Tomás Melendo, i Luis Supan. Metaphysics. Manila: Sinag-tala Publishers, 1991.
Cita MLA (9th ed.)
Alvira, Tomás, et al. Metaphysics. Sinag-tala Publishers, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.