Tulfo, R. . T. (2020). Covid-19 vaccine before yearend – Digong. Manila Times.
芝加哥风格引文Tulfo, Ramon T. "Covid-19 Vaccine Before Yearend – Digong." Manila Times 2020.
MLA引文Tulfo, Ramon T. "Covid-19 Vaccine Before Yearend – Digong." Manila Times, 2020.
警告：这些引文格式不一定是100％准确.