Castillo, R., & Maulit, G. (2002). Understanding and preventing polio. Philippine Star.
Lua i Stíl Chicago (17ú heag.)Castillo, Rebecca, agus Gener Maulit. "Understanding and Preventing Polio." Philippine Star 2002.
Lua MLA (9ú heag.)Castillo, Rebecca, agus Gener Maulit. "Understanding and Preventing Polio." Philippine Star, 2002.
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