The Center for Homeland Defense and Security website keeps track of the books used in its master’s degree program. The list is updated each time a new course begins.
Here is a link to the current book list: https://www.chds.us/?hsbooks
As the screenshot below shows, you can click the link at the upper right of the web page and see the books used in each of ten courses during the past two years. Click on each book to see the publishing information. (And, in case you are wondering, books are only part of the program’s reading requirements.)