Gamilla, O. a. H. P. V. Coal ban not law but strong policy. Philippine Daily Inquirer.
Lua i Stíl Chicago (17ú heag.)Gamilla, Orlando and Hazel P. Villa. "Coal Ban Not Law but Strong Policy." Philippine Daily Inquirer .
Lua MLA (9ú heag.)Gamilla, Orlando and Hazel P. Villa. "Coal Ban Not Law but Strong Policy." Philippine Daily Inquirer, .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.