Walby, Kevin; Monaghan, Jeffery (2016). “Private Eyes and Public Order: Policing and Surveillance in the Suppression of Animal Rights Activists in Canada”. In Bezanson, Kate; Webber, Michelle. Rethinking Society in the 21st Century (4th ed.). Toronto: Canadian Scholars. p. 148, note 1. ISBN978-1-55130-936-1. OCLC1002804017
Orr, Martin (2010). “The Failure of Neoliberal Globalization and the End of Empire”. In Berberoglu, Berch. Globalization in the 21st Century: Labor, Capital, and the State on a World Scale. Springer. p. 182. ISBN978-0-230-10639-0. OCLC700167013
Walby, Kevin; Monaghan, Jeffery (2016). “Private Eyes and Public Order: Policing and Surveillance in the Suppression of Animal Rights Activists in Canada”. In Bezanson, Kate; Webber, Michelle. Rethinking Society in the 21st Century (4th ed.). Toronto: Canadian Scholars. p. 148, note 1. ISBN978-1-55130-936-1. OCLC1002804017
Orr, Martin (2010). “The Failure of Neoliberal Globalization and the End of Empire”. In Berberoglu, Berch. Globalization in the 21st Century: Labor, Capital, and the State on a World Scale. Springer. p. 182. ISBN978-0-230-10639-0. OCLC700167013
Swearingen, M. Wesley (1995). FBI Secrets: An Agent's Expose. Boston: South End Press. ISBN978-0-89608-502-2. OCLC31330305. "[Special Agent Gregg York:] We expected about twenty Panthers to be in the apartment when the police raided the place. Only two of those black nigger fuckers were killed, Fred Hampton and Mark Clark."