Cita APA (7th ed.)

Cruz, I. A. (1999). Jointly or separately. IN Separate opinion [column]. Philippine Daily Inquirer.

Cita Chicago (17th ed.)

Cruz, Isagani A. "Jointly or Separately. IN Separate Opinion [column]." Philippine Daily Inquirer 1999.

Cita MLA (9th ed.)

Cruz, Isagani A. "Jointly or Separately. IN Separate Opinion [column]." Philippine Daily Inquirer, 1999.