(2006). The State of the Philippine environment (3rd ed. 2006.). IBON Databank and Research Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThe State of the Philippine Environment. 3rd ed. 2006. Quezon City: IBON Databank and Research Center, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्रThe State of the Philippine Environment. 3rd ed. 2006. IBON Databank and Research Center, 2006.
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