Urlanda, R. V. (2000). Mining: A sunset industry that could shine again. Philippine Panorama.
Chicago Style aipamenaUrlanda, Randy V. "Mining: A Sunset Industry That Could Shine Again." Philippine Panorama 2000.
MLA aipamenaUrlanda, Randy V. "Mining: A Sunset Industry That Could Shine Again." Philippine Panorama, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.