(2000). Las Piñas City, nanalo ng U.N. environment award. Kabayan.
Chicago Style aipamena"Las Piñas City, Nanalo Ng U.N. Environment Award." Kabayan 2000.
MLA aipamena"Las Piñas City, Nanalo Ng U.N. Environment Award." Kabayan, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.