Or, you can limit to books after you've searched by looking for source types in the left hand column.
Green Library is only able to purchase a very small percentage of the great number of History books that are published each year. That is why it is essential when conducting research to use other sources to locate relevant books. REMEMBER: you can almost always use interlibrary loan to request the books that you find for free and they will arrive within 3 to 4 business days.
Worlcat.org: This gigantic catalog has entries from thousands of libraries in the US and abroad. Downside is that searching in it can be messy. The link I've provided goes to the advanced search for more precise searching.
Google Books: This is one of my personal favorites for two reasons. First, for many books you can search (and preview) some of the text of the book. That helps you find books that have just a chapter or a few pages on your topic. Second, look for the Get this book bar, which usually appears to one side of the screen on both the preview and overview pages. Below a list of booksellers you will usually see a link called Find in a library. Click it and put WCU's zip code (19383) in the search box. If we have it, West Chester University Library will pop up as the first result and you can click on the link to go directly to our catalog! If we don't have it, you can also see if any other nearby libraries have a copy.
Amazon.com or other booksellers: One caveat, booksellers usually carry a mix of popular and academic titles. Try reading the description and seeing who the publisher is before you request a book.
Catalogs of larger university libraries: Most library catalogs can be searched by anyone (unlike databases, which are always limited to those associated with a particular school). So go to the library catalogs of large universities . Most catalogs work in a similar manner, so the search tips I provide in the left-hand column should apply to other catalogs as well.