Chipongian, L. (2000). Industries primed for clean air law. Manila Times.
Cita Chicago (17th ed.)Chipongian, Lee. "Industries Primed for Clean Air Law." Manila Times 2000.
Cita MLA (9th ed.)Chipongian, Lee. "Industries Primed for Clean Air Law." Manila Times, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.