@book{ title = "Briefe an eine Freundin", author = "Humboldt, Wilhelm von", year = "1870", publisher = "Brockhaus", address = "Leipzig", edition = "3.Aufl.", language = "ger", keywords = "Briefsammlung,Diede, Charlotte,Humboldt, Wilhelm von", content = "Resolving-System", "kostenfrei", "Volltext // Exemplar mit der Signatur: München, Bayerische Staatsbibliothek -- Epist. 1039 u", "kostenfrei", }