Langit, R. B. (1997). Water from polluted rivers to be recycled for drinking. Manila Times.
Cita Chicago (17th ed.)Langit, Richel B. "Water from Polluted Rivers to Be Recycled for Drinking." Manila Times 1997.
Cita MLA (9th ed.)Langit, Richel B. "Water from Polluted Rivers to Be Recycled for Drinking." Manila Times, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.