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Lua i Stíl Chicago (17ú heag.)Sadongdong, Martin A. "PH Gets Biggest Shipment of Sputnik V from Russia." Manila Bulletin 2021.
Lua MLA (9ú heag.)Sadongdong, Martin A. "PH Gets Biggest Shipment of Sputnik V from Russia." Manila Bulletin, 2021.
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