Local Government Development Foundation. (2000). Citizen's handbook on environmental protection. Local Government Development Foundation.
Cita Chicago (17th ed.)Local Government Development Foundation. Citizen's Handbook on Environmental Protection. Manila: Local Government Development Foundation, 2000.
Cita MLA (9th ed.)Local Government Development Foundation. Citizen's Handbook on Environmental Protection. Local Government Development Foundation, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.