Cita APA (7th ed.)

Agustin, C. L. (2001). A national ID number system. IN Opinion [column]. Philippine Star.

Cita Chicago (17th ed.)

Agustin, Carlos L. "A National ID Number System. IN Opinion [column]." Philippine Star 2001.

Cita MLA (9th ed.)

Agustin, Carlos L. "A National ID Number System. IN Opinion [column]." Philippine Star, 2001.