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Grutzpalk, Jonas. "Blood Feud and Modernity. Max Weber's and Émile Durkheim's Theory." Journal of Classical Sociology 2 (2002); p. 115–134.

Kreuzer, Peter. 2005. "Political Clans and Violence in the Southern Philippines." Frankfurt: Peace Research Institute Frankfurt. PDF

Torres, Wilfredo M. (ed). 2007. Rido: Clan Feuding and Conflict Management in Mindanao. Makati: The Asia Foundation. PDF

Torres, Wilfredo M. 2010. "Letting A Thousand Flowers Bloom: Clan Conflicts and their Management." Challenges to Human Security in Complex Situations: The Case of Conflict in the Southern Philippines. Kuala Lumpur: Asian Disaster Reduction and Response Network (ADRRN). PDF

Boehm, Christopher. 1984. Blood Revenge: The Anthropology of Feuding in Montenegro and Other Tribal Societies. Lawrence: University of Kansas. at Google Books

BBC: "In pictures: Egypt vendetta ends" May, 2005. "One of the most enduring and bloody family feuds of modern times in Upper Egypt has ended with a tense ceremony of humiliation and forgiveness. [...] Police are edgy. After lengthy peace talks, no one knows if the penance — and a large payment of blood money — will end the vendetta which began in 1991 with a children's fight."

15 clan feuds settled in Lanao; rido tops cause of evacuation more than war, from the MindaNews website. Posted on 13 July 2007.

2 clans in Matanog settle rido, sign peace pact, from the MindaNews website. Posted on 30 January 2008.