@book{ 0-1072545306, title = {Conquerors and rulers: social forces in medieval China}, author = {Eberhard, Wolfram}, address = {Leiden}, publisher = {Brill}, year = {1965}, edition = {2., rev. ed.}, language = {English}, url = {https://katalog.hgb-leipzig.de/Record/0-1072545306} }