reference man

例句：

1. 1. The book is a great reference for those studying history.
   这本书是研究历史的人很好的参考资料。
2. 2. The scientist cited several references to support his theory.
   这位科学家引用了几个参考文献来支持他的理论。
3. 3. She referred to the document as her final reference point.
   她把这份文件作为她最后的参考点。