@book{ title = "Mensch und Natur im Mittelalter", author = "Zimmermann, Albert", year = "1991", publisher = "de Gruyter", address = "Berlin [u.a.]", language = "ger","eng","fre", howpublished = "print", isbn = "3110131633", series = "Miscellanea mediaevalia, 21,1", content = "Inhaltsverzeichnis", }