@book{ title = "Die Werke Friedrichs des Großen", author = "Friedrich,Volz, Gustav Berthold,Menzel, Adolph von", year = "1914", publisher = "Hobbing", address = "Berlin", title = "in deutscher Übersetzung; zehn Bände", language = "ger", howpublished = "print", pages = "30 cm", }