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Lua i Stíl Chicago (17ú heag.)Mendez, Christina, agus Sheila Crisostomo. "Simultaneous Vaccination of HCWs, Frontliners, Elderly Pushed." Philippine Star 2021.
Lua MLA (9ú heag.)Mendez, Christina, agus Sheila Crisostomo. "Simultaneous Vaccination of HCWs, Frontliners, Elderly Pushed." Philippine Star, 2021.
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