1. Al Shabaab Joins Al-Qaeda
2. In Video, Somali ISIS Members Court al-Shabaab;Robyn Kriel;CNN,2015
3. The Reinvention of Al-Shabaab;Matt Bryden;Center for Strategic & international Studies,2014
4. See High Above
5. See also Tigneh Woldyie, Ethiopia's 2006 Military Intervention in Somalia: Critical Appraisal, PhD diss;M Abdisaid;IGAD Capacity Building Programme against Terrorism (ICPAT),2008