Citazione Stile APA (7a Edizione)

Tulfo, E. T. (2019). Smartmatic troubles, Noynoy's Legacy. IN Opinion [column]. Manila Standard.

Citazione stile Chigago Style (17a edizione)

Tulfo, Erwin T. "Smartmatic Troubles, Noynoy's Legacy. IN Opinion [column]." Manila Standard 2019.

Citatione MLA (9a ed.)

Tulfo, Erwin T. "Smartmatic Troubles, Noynoy's Legacy. IN Opinion [column]." Manila Standard, 2019.