@book{ title = "The orphan stone", author = "Berleth, Richard J.", year = "1990", publisher = "Greenwood Pr.", address = "New York u.a.", edition = "1. publ.", title = "the Minnesinger dream of Reich", language = "eng", isbn = "0313268568", keywords = "Geschichte,Civilization, Medieval, in literature,German poetry,History in literature,Minnesingers,Literatur,Mittelhochdeutsch,Minnesänger,Reichsidee,Minnesang", series = "Contributions to the study of world history, 15", content = "Inhaltsverzeichnis", }