Harbus, A. (2002). Helena of Britain in medieval legend. D.S. Brewer.
芝加哥风格引文Harbus, Antonina. Helena of Britain in Medieval Legend. Suffolk, UK ; Rochester, NY: D.S. Brewer, 2002.
MLA引文Harbus, Antonina. Helena of Britain in Medieval Legend. D.S. Brewer, 2002.
警告：这些引文格式不一定是100％准确.