It's possible that:
* The name is misspelled: Perhaps there's a slight variation in the spelling.
* The author is relatively unknown: They may have published smaller works or in a specific niche that isn't widely known.
* The author is using a pseudonym: Many authors use pen names.
To find out more, you could:
* Check online databases: Try searching for "Irene Schultz" on sites like WorldCat, LibraryThing, or Goodreads.
* Search academic databases: If you're looking for scholarly works, try searching databases like JSTOR or Google Scholar.
* Look for local libraries or bookstores: Local libraries might have a catalog you can search, or you can ask librarians for assistance.
Please provide more context if you can. Knowing the genre, time period, or specific book title could help narrow down the search.