1. Lesson Sixteen Assassinations Using Poisons and Cold Steelwww.dickdestiny.com/AL_QAEDA.DOC
2. Topic about: Make Ricinwww.ask.com/questions-about/Make-Ricin
3. How to make ricin?http://www.zoklet.net/bbs/archive/index.php/
4. Cyanide and Ricin, Homemadewww.weaponscombat.com/poisons/homemade-cyanide-and-homemade-ricin.html
5. Cooking up trouble. Jihadists and CBRN;Pita;CBRNe World,2008