Cita APA (7a ed.)

Ong, W. T. (2004). Smallpox vaccination campaigns 199th anniversary. IN Charter files [column]. Manila Bulletin.

Cita Chicago Style (17a ed.)

Ong, Willie T. "Smallpox Vaccination Campaigns 199th Anniversary. IN Charter Files [column]." Manila Bulletin 2004.

Cita MLA (9a ed.)

Ong, Willie T. "Smallpox Vaccination Campaigns 199th Anniversary. IN Charter Files [column]." Manila Bulletin, 2004.