Offemaria, R. (1999). Potable water: The world's most precious commodity. Manila Times.
Citazione stile Chigago Style (17a edizione)Offemaria, Rodel. "Potable Water: The World's Most Precious Commodity." Manila Times 1999.
Citatione MLA (9a ed.)Offemaria, Rodel. "Potable Water: The World's Most Precious Commodity." Manila Times, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.