Philippines. National Water and Air Pollution Control Commission. Report. 1st-. [s.n.
Cita Chicago (17th ed.)Philippines. National Water and Air Pollution Control Commission. Report. 1st-. Manila: [s.n.
Cita MLA (9th ed.)Philippines. National Water and Air Pollution Control Commission. Report. 1st-. [s.n.
Atenció: Aquestes cites poden no estar 100% correctes.