Vibal, M. R. (2022). The Centenarian Law. IN Letter [column]. Philippine Star.
Lua i Stíl Chicago (17ú heag.)Vibal, Mafeo R. "The Centenarian Law. IN Letter [column]." Philippine Star 2022.
Lua MLA (9ú heag.)Vibal, Mafeo R. "The Centenarian Law. IN Letter [column]." Philippine Star, 2022.
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