Profile: Terry Pratchett 31 Aralık 2008 tarihinde Wayback Machine sitesinde arşivlendi. "I'm a humanist, which means I'm an atheist, the trouble with being an atheist is that it lets God off the hook." BBC News. Retrieved 31 December 2008.
[1850-1952: The road to the founding congress], excerpted from International Humanist and Ethical Union 1952-2002: Past, present and future, Bert Gasenbeek and Babu Gogineni (eds.), De Tijdstroom uitgeverij, 2002, retrieved 19 October 2007 from the website of the International Humanist and Ethical Union 2 Ocak 2014 tarihinde Wayback Machine sitesinde arşivlendi..
Stringer-Hye, Richard (1999), "Charles Francis Potter", Dictionary of Unitarian and Universalist Biography, Unitarian Universalist Historical Society, 18 Şubat 2009 tarihinde kaynağından arşivlendi, erişim tarihi: 14 Mayıs 2006
Stringer-Hye, Richard (1999), "Charles Francis Potter", Dictionary of Unitarian and Universalist Biography, Unitarian Universalist Historical Society, 18 Şubat 2009 tarihinde kaynağından arşivlendi, erişim tarihi: 14 Mayıs 2006
[1850-1952: The road to the founding congress], excerpted from International Humanist and Ethical Union 1952-2002: Past, present and future, Bert Gasenbeek and Babu Gogineni (eds.), De Tijdstroom uitgeverij, 2002, retrieved 19 October 2007 from the website of the International Humanist and Ethical Union 2 Ocak 2014 tarihinde Wayback Machine sitesinde arşivlendi..
Profile: Terry Pratchett 31 Aralık 2008 tarihinde Wayback Machine sitesinde arşivlendi. "I'm a humanist, which means I'm an atheist, the trouble with being an atheist is that it lets God off the hook." BBC News. Retrieved 31 December 2008.