 These first two periods are both partly covered by the Polish philosopher and historian of ideas, Leszek Kołakowski, in the final two volumes of his encyclopaedic three volume Main Currents of Marxism (1976 [1978]). A succinct critical account of the emergence and distinctive character of Western Marxism is provided by Perry Anderson in his Considerations on Western Marxism (1976). And some of the more philosophically interesting authors in this latter tradition are also covered elsewhere in this Encyclopaedia (see the  Related Entries  section below). Finally, and edging a little into the third of these historical periods, Christoph Henning offers an account of the (mis) readings of Marx—especially those replacing social theory with moral philosophy—in German philosophy from Heidegger to Habermas and beyond, in his Philosophy After Marx (2014).