Das Kapital, also called Capital, A Critique of Political Economy (German: Das Kapital. Kritik der politischen Oekonomie, pronounced [das kapiˈtaːl kʁɪˈtiːk deːɐ poˈliːtɪʃən økonomˈiː]; 1867–1883) by Karl Marx is a foundational theoretical text in materialist philosophy, economics and politics. Marx aimed to reveal the economic patterns underpinning the capitalist mode of production, in contrast to classical political economists such as Adam Smith, Jean-Baptiste Say, David Ricardo and John Stuart Mill. Marx did not live to publish the planned second and third parts, but they were both completed from his notes and published after his death by his colleague Friedrich Engels. Das Kapital is the most cited book in the social sciences published before 1950.