De Leon, I. C. (2001). Solid Waste Law signed to Address garbage problem. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDe Leon, Isabel C. "Solid Waste Law Signed to Address Garbage Problem." Manila Bulletin 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDe Leon, Isabel C. "Solid Waste Law Signed to Address Garbage Problem." Manila Bulletin, 2001.
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