Book impact can include reviews of a book, both scholarly and popular, publisher influence, sales figures (when available), and numbers of libraries that provide access to the title (in print and/or electronic format). In some cases, the number of libraries providing access is not enough evaluative information but, instead, which specific libraries provide access to the title as well.
There are a number of databases that index and/or include book reviews. Below are relevant databases for finding book reviews in English Studies.
The following may be useful if your work caught the attention of other, related disciplines:
To search WorldCAT: