Urlanda, R. V. (2000). Mining: A sunset industry that could shine again. Philippine Panorama.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUrlanda, Randy V. "Mining: A Sunset Industry That Could Shine Again." Philippine Panorama 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUrlanda, Randy V. "Mining: A Sunset Industry That Could Shine Again." Philippine Panorama, 2000.
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