Thayer, John S. (2010), "Relativistic Effects and the Chemistry of the Heavier Main Group Elements", Relativistic Methods for Chemists, Challenges and Advances in Computational Chemistry and Physics, 10, m/s. 81, doi:10.1007/978-1-4020-9975-5_2, ISBN978-1-4020-9974-8
Radvanyi, Pierre; Villain, Jacques (Nov 2017). "La découverte de la radioactivité". Comptes Rendus. Physique (dalam bahasa Perancis). 18 (9–10): 548. doi:10.1016/j.crhy.2017.10.008.
Weeks, Mary Elvira (1933). "The discovery of the elements. XIX. The radioactive elements". Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.
Weeks, Mary Elvira (1933). "The discovery of the elements. XIX. The radioactive elements". Journal of Chemical Education. 10 (2): 79. Bibcode:1933JChEd..10...79W. doi:10.1021/ed010p79.