- http://atheism.about.com/od/aboutagnosticism/a/theism.htm
- http://www.patheos.com/blogs/camelswithhammers/2009/10/distinguishing-the-atheist-agnostic-the-theist-gnostic-the-atheist-gnostic-and-the-theist-agnostic/
- http://www.gotquestions.org/deism.html
- http://www.infoplease.com/dictionary/brewers/theist-deist-atheist-agnostic.html
- http://www.eoht.info/page/Dawkins+scale
- https://shadowtolight.wordpress.com/2012/06/24/dawkins-7-point-scale/