author = { Marx, Karl AND Engels, Friedrich },

title = { Werke 31 [Briefe, Oktober 1864 - Dezember 1867] },

edition = { 2. Aufl. } ,

publisher = {Dietz},

year = {1973},

address = { Berlin },

url = { http://slubdd.de/katalog?TN_libero_mab2 }