[1] Theses On Feuerbach by Karl Marx
https://www.marxists.org/archive/marx/works/1845/theses/theses.htm
[2] A Contribution to the Critique of Political Economy by Karl Marx
https://www.marxists.org/archive/marx/works/1859/critique-pol-economy/index.htm
[3] Critique of the Gotha Programme by Karl Mar
