Philippine Center for Investigative Journalism. (2016). Pre-campaign ads hit P6.7B. Manila Bulletin.
Chicago-referens (17:e uppl.)Philippine Center for Investigative Journalism. "Pre-campaign Ads Hit P6.7B." Manila Bulletin 2016.
MLA-referens (9:e uppl.)Philippine Center for Investigative Journalism. "Pre-campaign Ads Hit P6.7B." Manila Bulletin, 2016.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.