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Friedrich Engels, Revolution and Counter-Revolution in Germany, 1848 (1851-1852)
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in The Marx-Engels Collected Works, Vol. 11 (London: Lawrence and Wishart, 1979), p. 3-98.
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online at https://www.marxists.org/archive/marx/works/1852/germany/index.htm
Karl Marx, The Eighteenth Brumaire of Louis Bonaparte (1852)
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in Later Political Writings, trans. Terrell Carver (Cambridge: Cambridge University Press, 1996), pp. 31-127.
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in The Marx-Engels Collected Works, Vol. 11 (London: Lawrence and Wishart, 1979), p. 101-197
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online at marxists.org/archive/marx/works/1852/18th-brumaire