Karl Marx, Friedrich Engels (2014). “The Communist Manifesto: with selections from The Eighteenth Brumaire of Louis Bonaparte and Capital by Karl Marx”, p.9, John Wiley & Sons
Karl Marx, Friedrich Engels, Philip Gasper (2005). “The Communist Manifesto: A Road Map to History's Most Important Political Document”, p.128, Haymarket Books
Karl Marx, Friedrich Engels, Philip Gasper (2005). “The Communist Manifesto: A Road Map to History's Most Important Political Document”, p.71, Haymarket Books