Custodio, R. (2000). Laguna de Bay polluted ; loses potential as source of tap water. Manila Times.
Chicago-referens (17:e uppl.)Custodio, Rene. "Laguna De Bay Polluted ; Loses Potential as Source of Tap Water." Manila Times 2000.
MLA-referens (9:e uppl.)Custodio, Rene. "Laguna De Bay Polluted ; Loses Potential as Source of Tap Water." Manila Times, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.