Não informado. Potassium, Potasio, Kalium Symposium. International Potash Institute.
Chicagoスタイル(17版)引用形式Não informado. Potassium, Potasio, Kalium Symposium. Berne: International Potash Institute.
MLA(8版)引用形式Não informado. Potassium, Potasio, Kalium Symposium. International Potash Institute.
警告: この引用は必ずしも正確ではありません.