APA (7e ed.) Bronvermelding

Não informado. (1980). Soil and water conservation news. U.S. Department of Agriculture, Soil Conservation Service.

Chicago (17e ed.) Bronvermelding

Não informado. Soil and Water Conservation News. Washington: U.S. Department of Agriculture, Soil Conservation Service, 1980.

MLA (8e ed.) Bronvermelding

Não informado. Soil and Water Conservation News. U.S. Department of Agriculture, Soil Conservation Service, 1980.

Let op: Deze citaties zijn niet altijd 100% accuraat.