High-ranking' al-Shabab leader killed in U.S. strike
Al-Shabaab in Somalia: The History and Ideology of a Militant Islamist Group - Kindle edition by Hansen, Stig Jarle. Politics & Social Sciences Kindle eBooks @ Amazon.com.
Al Shabaab's insurgency and the Somalian imbroglio in the Horn of Africa | ORF
Al-Shabaab faction pledges allegiance to ISIS | CNN