Calayag, K. (2021). Duterte wants Filipinos to express their opinion on VFA. Manila Times.
Chicago-referens (17:e uppl.)Calayag, Keith. "Duterte Wants Filipinos to Express Their Opinion on VFA." Manila Times 2021.
MLA-referens (9:e uppl.)Calayag, Keith. "Duterte Wants Filipinos to Express Their Opinion on VFA." Manila Times, 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.