Castillo, R. Reducing in-car pollution. Philippine daily inquirer.
Lua i Stíl Chicago (17ú heag.)Castillo, Rafael. "Reducing In-car Pollution." Philippine Daily Inquirer .
Lua MLA (9ú heag.)Castillo, Rafael. "Reducing In-car Pollution." Philippine Daily Inquirer, .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.