The library's collection includes both print and electronic books (eBooks). Each can be found using the online catalog, but only eBooks can be accessed and read online. You can quickly evaluate the contents of a book by reading the introduction, the table of contents, and the index. Since a book is a work on a single topic, it may be longer and more in-depth than a typical journal article.
If the WSU library doesn't have what you need, consider the following resources:
WorldCat - a free database of resources at libraries worldwide. You can find titles you need in a regional library.