WSU WorldCat is the best place to find books.
For books or media items you find located at one of the Pullman campus libraries, note which library houses it, and write down the "Call number."

Example - This book is located in the Education Library (Cleveland Hall)..
How to get a book from...
Books in WSU WorldCat
...a WSU Branch Campus
If the item is located at one of the WSU branch campuses, click on the Request Item button. Enter your network ID and password. When the book is delivered to Pullman, you will receive an email so you can pick it up.

...a Summit library.
If the WSU Libraries do not own the item, you may see a Request Summit Item button. Click it, and enter your network ID and password. When the book is delivered to Pullman, you will receive an email so you can pick it up.

...Interlibrary Loan
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If the WSU Libraries do not own the item, you may see a Request Item through Interlibrary Loan button. Click it, and enter your network ID and password. When the book is delivered to Pullman, you will receive an email so you can pick it up.

For more information on using WSU WorldCat, review the WSU WorldCat guide.