The Mahalo Top 7
- Wikipedia: Castor Oil Plant
- Nova Scotia Museum: Castor Bean
- Cornell University: Castor Bean
- Purdue University: Castor Beans
- Wayne's World: Castor Bean Plant
- USATODAY.com: The World's Most Poisonous Plant and Smallest Fish (March 6, 2006)
- 5min Life Videopedia: The Castor Bean Plant (Time: 1:23)
Castor Beans News
- Topix.net: Castor Beans
- Google News: Castor Beans
- Fujitsu Official Site: Fujitsu Develops New Bio-Based Polymer from Castor Oil (December 7, 2006)
- USAToday: The World's Most Poisonous Plant..." (March 20, 2006)
- Walta Information Center: Castor Oil Energy Project successful in Ethiopia (August 1, 2008)
Castor Beans Blogs and Commentaries
- Google Blog Search: Castor Beans
- Tim Worstall Tabloid Edition: Ricin (February 29, 2008)
