National Water Resources Council. (1980). Philippines water data, 1970-. National Hydraulic Research Center.
Chicago-referens (17:e uppl.)National Water Resources Council. Philippines Water Data, 1970-. Quezon City: National Hydraulic Research Center, 1980.
MLA-referens (9:e uppl.)National Water Resources Council. Philippines Water Data, 1970-. National Hydraulic Research Center, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.