Cogent. [s.n.].
Cita Chicago (17th ed.)Cogent. Quezon City: [s.n.].
Cita MLA (9th ed.)Cogent. [s.n.].
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)
Cogent. [s.n.].
Cita Chicago (17th ed.)Cogent. Quezon City: [s.n.].
Cita MLA (9th ed.)Cogent. [s.n.].