APA (7e ed.) Bronvermelding

Não informado. (1935). Soil conservation. U.S. Department of Agriculture, Soil Conservation Service.

Chicago (17e ed.) Bronvermelding

Não informado. Soil Conservation. Washington: U.S. Department of Agriculture, Soil Conservation Service, 1935.

MLA (8e ed.) Bronvermelding

Não informado. Soil Conservation. U.S. Department of Agriculture, Soil Conservation Service, 1935.

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