APA (7e ed.) Bronvermelding

Não informado. (1987). The Journal of Agricultural Economics Research. U.S. Department of Agriculture.

Chicago (17e ed.) Bronvermelding

Não informado. The Journal of Agricultural Economics Research. Washington: U.S. Department of Agriculture, 1987.

MLA (8e ed.) Bronvermelding

Não informado. The Journal of Agricultural Economics Research. U.S. Department of Agriculture, 1987.

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