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Gage, Beverly. (2007). "Why Violence Matters: Radicalism, Politics, and Class War in the Gilded Age and Progressive Era". Journal for the Study of Radicalism. 1 (1): 99–109. doi:10.1353/jsr.2008.0021. ISSN1930-1197. S2CID154748636.
Dell'Arti, Giorgio (January 26, 2002). "La Storia di Mario Buda"(PDF) (in Italian). Io Donna. Archived from the original(PDF) on October 27, 2007. Retrieved July 15, 2008.
Gage, Beverly. (2007). "Why Violence Matters: Radicalism, Politics, and Class War in the Gilded Age and Progressive Era". Journal for the Study of Radicalism. 1 (1): 99–109. doi:10.1353/jsr.2008.0021. ISSN1930-1197. S2CID154748636.