APA (7e ed.) Bronvermelding

Não informado. (1977). Crops and soils magazine. American Society of Agronomy.

Chicago (17e ed.) Bronvermelding

Não informado. Crops and Soils Magazine. Madison, Wis: American Society of Agronomy, 1977.

MLA (8e ed.) Bronvermelding

Não informado. Crops and Soils Magazine. American Society of Agronomy, 1977.

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