Pass the U.S. citizenship exam.
Citizenship made simple : an easy to read guide to the U.S. citizenship process
McGraw-Hill's U.S. citizenship test with DVD
Becoming a U.S. citizen : a guide to the law, exam, & interview.
Becoming a U.S. citizen : understanding the naturalization process.
Barron's U.S. citizenship test.
Those Jensen boys!
The end of all things
One year after