American Government: A Complete Coursebook is a great resource book. I know, as a student, that you can find a lot of topics in this book that aren't even touched upon in any ordinary textbook. This is a wonderful resource, especially for Economic, Legal, and Political Systems (ELPS) students, and U.S. History students. From the definition of "bill", to 105+ Supreme Court cases, this book has found almost all of the information I have needed. Maybe, it will work for you or your student too.