San Juan, A. D. (2022). COVID vax certificates of 4 more countries recognized. Manila Bulletin.
Chicagoスタイル(17版)引用形式San Juan, Alexandria Dennise. "COVID Vax Certificates of 4 More Countries Recognized." Manila Bulletin 2022.
MLA(9版)引用形式San Juan, Alexandria Dennise. "COVID Vax Certificates of 4 More Countries Recognized." Manila Bulletin, 2022.
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