(2009). World Environment Day 2009. IN Editorial [column]. Manila Bulletin.
Cita Chicago (17th ed.)"World Environment Day 2009. IN Editorial [column]." Manila Bulletin 2009.
Cita MLA (9th ed.)"World Environment Day 2009. IN Editorial [column]." Manila Bulletin, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.