Talk:Radium, and Other Radioactive Substances

I've mentioned in the 1st paragraph that Hammer was about 50 when he published the book the Wikipedia page is about. I derived his age from his Wikipedia entry. If someone knows the correct manner of indicating the source of the information, I would be grateful if they were to improve the page accordingly. — Preceding unsigned comment added by 2011-07-04T09:33:08‎ (talk • contribs) Tkbwik