Thomas Jefferson, Barbara B. Oberg, Lyman Henry Butterfield, Charles T. Cullen, John Catanzariti (2003). “The papers of Thomas Jefferson: 1 January 1798 to 31 January 1799”, Princeton Univ Pr
Karl Marx, Friedrich Engels, Philip Gasper (2005). “The Communist Manifesto: A Road Map to History's Most Important Political Document”, p.128, Haymarket Books