Não informado. (1964). Soil and water. National Water and Soil Conservation Organization.
Chicago (17e ed.) BronvermeldingNão informado. Soil and Water. Wellington: National Water and Soil Conservation Organization, 1964.
MLA (8e ed.) BronvermeldingNão informado. Soil and Water. National Water and Soil Conservation Organization, 1964.
Let op: Deze citaties zijn niet altijd 100% accuraat.