Não informado. Potassium, Potasio, Kalium Symposium. International Potash Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Potassium, Potasio, Kalium Symposium. Berne: International Potash Institute.
Lua MLA (8ú heag.)Não informado. Potassium, Potasio, Kalium Symposium. International Potash Institute.
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