Stiftung Gralsbotschaft. (1973). Publications of the Grail Message Foundation.
芝加哥风格引文Stiftung Gralsbotschaft. Publications of the Grail Message Foundation. Stuttgart, 1973.
MLA引文Stiftung Gralsbotschaft. Publications of the Grail Message Foundation. 1973.
警告：这些引文格式不一定是100％准确.