Tulfo, R. . T. (2020). Covid-19 vaccine before yearend – Digong. Manila Times.
Chicagoスタイル(17版)引用形式Tulfo, Ramon T. "Covid-19 Vaccine Before Yearend – Digong." Manila Times 2020.
MLA(9版)引用形式Tulfo, Ramon T. "Covid-19 Vaccine Before Yearend – Digong." Manila Times, 2020.
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