Perante, C. M. (2005). Mining activities won't ruin Alayan cave system in Nueva Vizcaya, execs assure. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPerante, Cesar M. "Mining Activities Won't Ruin Alayan Cave System in Nueva Vizcaya, Execs Assure." Manila Bulletin 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPerante, Cesar M. "Mining Activities Won't Ruin Alayan Cave System in Nueva Vizcaya, Execs Assure." Manila Bulletin, 2005.
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