National Water Resources Council. (1983). Bicol framework plan: Albay-Sorsogon basins. NWRC.
Chicago (17e ed.) BronvermeldingNational Water Resources Council. Bicol Framework Plan: Albay-Sorsogon Basins. Quezon City: NWRC, 1983.
MLA (9e ed.) BronvermeldingNational Water Resources Council. Bicol Framework Plan: Albay-Sorsogon Basins. NWRC, 1983.
Let op: Deze citaties zijn niet altijd 100% accuraat.