Calayag, K. (2021). Sinovac vaccines here end of February – Palace. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCalayag, Keith. "Sinovac Vaccines Here End of February – Palace." Manila Times 2021.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCalayag, Keith. "Sinovac Vaccines Here End of February – Palace." Manila Times, 2021.
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