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Lua i Stíl Chicago (17ú heag.)Sadongdong, Martin A. "Russia Delivers 132,200 Doses of Sputnik V Vaccine to PH." Manila Bulletin 2021.
Lua MLA (9ú heag.)Sadongdong, Martin A. "Russia Delivers 132,200 Doses of Sputnik V Vaccine to PH." Manila Bulletin, 2021.
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