If WCU Libraries doesn't have the book you need, either request the book use our Interlibrary Loan service, E-Z Borrow - see http://www.wcupa.edu/library.fhg/illoans.asp or, particularly for children's books, you may wish to borrow books in person from the Chester County Library System (CCLS) of public libraries. Take your driver's license/proof of residency or library card from another Pennsylvania public library with you. These libraries usually have more current fiction books and children's books available than the academic libraries in the E-Z Borrow system.
Another online library catalog - of worldwide library holdings - is available at WorldCat.org.
When you find a title, you will see a list of libraries nearby that own it. Using WorldCat is a good way to look for more books on a subject, but to borrow the book, use the WCU Libraries Interlibrary Loan service.
Other library catalogs can help identify more resources in a subject area, or a specific resource at a local library.