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Lua i Stíl Chicago (17ú heag.)Roces, Alejandro R. "Environmentalist One of Gusi Prize Awardees. IN Roses & Thorns [column]." Philippine Star 2007.
Lua MLA (9ú heag.)Roces, Alejandro R. "Environmentalist One of Gusi Prize Awardees. IN Roses & Thorns [column]." Philippine Star, 2007.
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