Não informado. (1985). Better Crops International. Potash & Phosphate Institute.
Chicagoスタイル(17版)引用形式Não informado. Better Crops International. Atlanta, Ga: Potash & Phosphate Institute, 1985.
MLA(8版)引用形式Não informado. Better Crops International. Potash & Phosphate Institute, 1985.
警告: この引用は必ずしも正確ではありません.