1. Humanist manifesto II;American Humanist Association.;The Humanist,1973
2. Bard , M. The Munich massacre. http:www.us-israel.orgjsourceTerrorismmunich.html
3. Cable News Network. 2002 Terror victim comparison [chart] http:www.cnn.comSPECIALS2002terror.victimsindex.html