1. Arimatsu, L., & Choudbury, M. (2014). The legal classification of the armed conflicts in Syria, Yemen and Libya. The Chatham House.
2. Arraf, S. (2017). The armed conflict in Yemen: A complicated Mosaic (The War Report 2017). Geneva Academy.
3. Black, I. (2015). Yemen conflict continues despite Saudi Arabia claiming to have ended campaign. The Guardian. https://www.theguardian.com/world/2015/apr/22/yemen-crisis-air-strike-hits-adenafter-saudiarabia-ends-bombing-campaign. Accessed 8 November 2020.
4. Boucek, C. (2010). Yemen: Avoiding a downward spiral. In C. Boucek & M. Ottaway (Eds.), Yemen on the brink (pp. 1–30). The Carnegie Endowment.
5. Brehony, N. (2011). Yemen divided: The story of a failed state in South Arabia. I.B. Tauris.