@book{ title = "Artes im Mittelalter", author = "Schaefer, Ursula", year = "1999", publisher = "Akad.-Verl.", address = "Berlin", language = "ger", howpublished = "print", isbn = "305003307X", keywords = "Kongress,Artes liberales", pages = "24 cm", content = "Inhaltsverzeichnis", }