There is no access to print books at this time, though they will still show up in your search results. Once you are at the search results screen, you can click "Online" to limit to online materials.
This guide will help you locate books, articles, and other sources that can help with your political science research.
There are several types of sources you will want to look for in researching your political science topics:
Barack Obama at Resolute Desk. By White House (Pete Souza). CC BY 2.0 or Public domain via Wikimedia Commons.