Urlanda, R. V. (2000). Mining: A sunset industry that could shine again. Philippine Panorama.
Lua i Stíl Chicago (17ú heag.)Urlanda, Randy V. "Mining: A Sunset Industry That Could Shine Again." Philippine Panorama 2000.
Lua MLA (9ú heag.)Urlanda, Randy V. "Mining: A Sunset Industry That Could Shine Again." Philippine Panorama, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.