是可数的，例如：

1、There is a list of references at the end of each chapter.每一章的后面都有一组参考书目。

2、The book is full of references to growing up in India.这本书谈到许多在印度怎样长大成人的事。

3、He conned his way into the job using false references.他用假的推荐信骗取了那份工作。