Siegfried, R. (1963). „The Discovery of Potassium and Sodium, and the Problem of the Chemical Elements”. Isis. 54 (2): 247—258. JSTOR228541. PMID14147904. doi:10.1086/349704.
Shaposhnik, V. A. (2007). „History of the discovery of potassium and sodium (on the 200th anniversary of the discovery of potassium and sodium)”. Journal of Analytical Chemistry. 62 (11): 1100—1102. S2CID96141217. doi:10.1134/S1061934807110160.
Siegfried, R. (1963). „The Discovery of Potassium and Sodium, and the Problem of the Chemical Elements”. Isis. 54 (2): 247—258. JSTOR228541. PMID14147904. doi:10.1086/349704.
Siegfried, R. (1963). „The Discovery of Potassium and Sodium, and the Problem of the Chemical Elements”. Isis. 54 (2): 247—258. JSTOR228541. PMID14147904. doi:10.1086/349704.
Shaposhnik, V. A. (2007). „History of the discovery of potassium and sodium (on the 200th anniversary of the discovery of potassium and sodium)”. Journal of Analytical Chemistry. 62 (11): 1100—1102. S2CID96141217. doi:10.1134/S1061934807110160.