De Leon, I. C. (2001). Solid Waste Law signed to Address garbage problem. Manila Bulletin.
Chicago-viite (17. p.)De Leon, Isabel C. "Solid Waste Law Signed to Address Garbage Problem." Manila Bulletin 2001.
MLA-viite (9. p.)De Leon, Isabel C. "Solid Waste Law Signed to Address Garbage Problem." Manila Bulletin, 2001.
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