《资治通鉴·陈纪·陈纪四》
通向恒棱的道路有两条，一条平坦一条险要，有几个獠人头目来见赵文表，愿意充当向导。
獠中先有二路，一平一险，有獠帅数人来请为乡导。
There were two paths leading to Hengling, one level and one dangerous. Several Laos chiefs came to see Zhao Wenbiao and offered to be their guides.