«The Discovery of the Elements: XV. Some Elements Predicted by Mendeleeff». Journal of Chemical Education, 9, 9, 1932, pàg. 1605–1619. Bibcode: 1932JChEd...9.1605W. DOI: 10.1021/ed009p1605.
«The Discovery of the Elements: XV. Some Elements Predicted by Mendeleeff». Journal of Chemical Education, 9, 9, 1932, pàg. 1605–1619. Bibcode: 1932JChEd...9.1605W. DOI: 10.1021/ed009p1605.