Calayag, K. (2020). Duterte backs Duque in vaccine deal ‘mess’. Manila Times.
芝加哥风格引文Calayag, Keith. "Duterte Backs Duque in Vaccine Deal ‘mess’." Manila Times 2020.
MLA引文Calayag, Keith. "Duterte Backs Duque in Vaccine Deal ‘mess’." Manila Times, 2020.
警告：这些引文格式不一定是100％准确.