APA (7e ed.) Bronvermelding

Não informado. (1985). Better Crops International. Potash & Phosphate Institute.

Chicago (17e ed.) Bronvermelding

Não informado. Better Crops International. Atlanta, Ga: Potash & Phosphate Institute, 1985.

MLA (8e ed.) Bronvermelding

Não informado. Better Crops International. Potash & Phosphate Institute, 1985.

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