The German Ideology by Karl Marx and Frederick Engels https://marxistleninists.org/M&E/1845/german-ideology/ch03m.htm
Lenin: What Our Liberal Bourgeois Want, and What They Fear https://www.marxists.org/archive/lenin/works/1905/sep/14.htm
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Study Guide for Marx's The German Ideology I. 1845 https://marxistleninists.org/M&E/1845/german-ideology/guide.htm