^Liljenzin, Jan-Olov; Rydberg, Jan; Choppin, Gregory R. Radiochemistry and nuclear chemistry 2nd ed. Oxford: Butterworth-Heinemann. 1995: 3–5. ISBN 0-7506-2300-4. OCLC 31433875. 引文格式1维护:冗余文本 (link)
^Strömholm, D.; Svedberg, The. Untersuchungen über die Chemie der radioaktiven Grundstoffe. I. Zeitschrift für anorganische Chemie. 1909-02-14, 61 (1). doi:10.1002/zaac.19090610126(英语).
^Cameron, Alexander Thomas. Radium and Radioactivity. Society for promoting Christian knowledge. 1912 (英语).
^Thomson, J.J. XIX. Further experiments on positive rays. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 1912-08, 24 (140). ISSN 1941-5982. doi:10.1080/14786440808637325(英语).
^Thomson, J.J. LXXXIII. Rays of positive electricity. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 1910-10, 20 (118). ISSN 1941-5982. doi:10.1080/14786441008636962(英语).