Impact metrics are traditionally easier to assess for authors, journals, and individual articles in STEM fields. In fields that publish primarily in book chapters or in books, metrics may be harder to determine, and it is advisable to collect a wide range of numbers to better show your impact:
1- Go to Google Scholar and enter the name of the Book, Book Chapter, and Author.
2- Look for the entry labelled [BOOK]
3- Look for "Cited By", below the entry