Feldman, Jack. "Abu Sayyaf"(PDF). Center for Strategic and International Studies. Archived from the original(PDF) on April 17, 2015. Retrieved May 16, 2015.
Zenn, Jacob (2019). "The Islamic State's Provinces on the Peripheries: Juxtaposing the Pledges from Boko Haram in Nigeria and Abu Sayyaf and Maute Group in the Philippines". Perspectives on Terrorism. 13 (1): 87–104. ISSN2334-3745. JSTOR26590511.
Feldman, Jack. "Abu Sayyaf"(PDF). Center for Strategic and International Studies. Archived from the original(PDF) on April 17, 2015. Retrieved May 16, 2015.
Zenn, Jacob (2019). "The Islamic State's Provinces on the Peripheries: Juxtaposing the Pledges from Boko Haram in Nigeria and Abu Sayyaf and Maute Group in the Philippines". Perspectives on Terrorism. 13 (1): 87–104. ISSN2334-3745. JSTOR26590511.