"USA Citizenship Interview and Test Practice Made Easy " is an excellent, comprehensive citizenship reference and study guide/workbook.
This book explains how to become a U.S. citizen from Green Card to taking the Oath of Allegiance and will help you prepare to pass the U.S. citizenship test and interview. This is a well organized book, and the clear writing will also be understood by immigrants who are learning English as a second language..
Part 1 answers your questions about the citizenship process.

Part II gives you ways to practice for the citizenship interview and test....