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:
How many Libraries have your book (use Worldcat)
Has it been listed as a Best Seller or Recommended Reading?
Find materials at Tulane University and in libraries worldwide. View local holdings or borrow from U.S. libraries using Interlibrary Loan (ILL). Two different interfaces, the first via open-access (WorldCat Local) and the second, more in-depth option via subscription (FirstSearch, via the Tulane University icon link), offer unique user experiences.
Search results often include "Cited by ##" links below the citation, which leads you to other articles available to Google's robots. Full text may not be available via Google, but the library probably has it in a subscription database or print copy for you.