Bennett Clifford and Helen Powell, Program on Extremism, The George Washington University, June 2019
Nikhil Raj Aggrawal, Observer Research Foundation, May 28, 2019
Audrey Alexander and Bennett Clifford, Combating Terrorism Center, CTCSENTINEL, Volume 12, Issue 4, April 2019
Maura Conway, Moign Khawaja, Suraj Lakhani, Jeremy Reffin, Andrew Robertson and David Weir, Studies in Conflict & Terrorism, 42 (1-2): 141-160 (2019)
Paper presented at the 2nd European Counter Terrorism Centre (ECTC) Advisory Group conference, Europol Headquarters, The Hague, April 17-18, 2018
Mitch Prothero, December 8, 2018
David P. Fidler, Council of Foreign Affairs, June 18, 2015.