Hufschmid, M. (2021). The crusade against the Staufer in Germany, 1246-51.
芝加哥风格引文Hufschmid, M. The Crusade Against the Staufer in Germany, 1246-51. 2021.
MLA引文Hufschmid, M. The Crusade Against the Staufer in Germany, 1246-51. 2021.
警告：这些引文格式不一定是100％准确.