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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"2 Promising Vaccines Against COVID-19. IN Editorial [column]." Manila Bulletin 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"2 Promising Vaccines Against COVID-19. IN Editorial [column]." Manila Bulletin, 2020.
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