Calayag, K. (2020). Duterte wants all Filipinos vaccinated against Covid-19. Manila Times.
芝加哥风格引文Calayag, Keith. "Duterte Wants All Filipinos Vaccinated Against Covid-19." Manila Times 2020.
MLA引文Calayag, Keith. "Duterte Wants All Filipinos Vaccinated Against Covid-19." Manila Times, 2020.
警告：这些引文格式不一定是100％准确.