We particularly recommend the following:
Work and WealthMarx and Engels ArchiveSome remarks about their capitalistic relation
The Democratic State: Critique of Bourgeois SovereigntyMy state, your state, our state
Psychology of the Private Individual: Critique of Bourgeois ConsciousnessA society of psychos?
Critique of the political economy of capitalism
In Spanish: In German:MSZ - Gegen die Kosten der Freiheit