FAS: Mujahedin-e Khalq Organization (MEK or MKO) - Description, activities, strength, area of operation and external aid. Links to additional resources. From the Federation of American Scientists. USA. - http://www.fas.org/irp/world/para/mek.htm
ICT: Mujahedin-e Khalq Organization (MEK or MKO) - History, terrorist activity, updates and history of attacks. From The International Policy Institute for Counter-Terrorism, Israel. - http://www.ict.org.il/inter_ter/orgdet.cfm?orgid=24