National Consortium for the Study of Terrorism and the Responses to Terrorism, DHS (1 de marzo de 2008). «Terrorist Organization Profile: May 19 Communist Order». National Consortium for the Study of Terrorism and the Responses to Terrorism. Archivado desde el original el 7 de junio de 2010. Consultado el 27 de diciembre de 2009.
«GTD ID:198111230004». Global Terrorism Database. Consultado el 15 de enero de 2020.
National Consortium for the Study of Terrorism and the Responses to Terrorism, DHS (1 de marzo de 2008). «Terrorist Organization Profile: May 19 Communist Order». National Consortium for the Study of Terrorism and the Responses to Terrorism. Archivado desde el original el 7 de junio de 2010. Consultado el 27 de diciembre de 2009.
worldcat.org
Let freedom ring : a collection of documents from the movements to free U.S. political prisoners. Meyer, Matt. Montreal, Quebec: Kersplebedeb. 2008. ISBN9781604861471. OCLC435638256.
Meyer, Matt. (2009). Let Freedom Ring: A Collection of Documents From the Movements to Free U.S. Political Prisoners. PM Press. OCLC938890598.