author = { Friedrich, Caspar David AND Beer, Johannes },

title = { Caspar David Friedrich },

edition = { Feldpostausg. } ,

publisher = {Langewiesche},

year = {[1937]},

booktitle = {Der eiserne Hammer},

address = { Königstein i. T. },

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