First search the library catalog or website.
1. To save a group of items, click on the folder icon in the location bar of your browser.
2. Select the items you want to add.
3. This box on the lower right on your screen shows Zotero saving the items.
Now, click on the Zotero icon in your browser (or on your desktop) to open your library and see the book citations you added.
To add a single book, simply open the book record in the catalog, then click on the page icon in the browser location bar.
You can also add books by ISBN number, using the "Add Item by Identifier" button on the Zotero toolbar.