Feldman, Jack. "Abu Sayyaf"(PDF). Center for Strategic and International Studies. Archived from the original(PDF) on April 17, 2015. Retrieved May 16, 2015.
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.
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.