Can`anybody recommend a book on the 'Klu Klux Klan'?

I'm currently studying the civil rights movement in the USA and have copies of Martin Luther King Jr. & Malcolm X writings but to really get a total view on the subject am looking for writings from the other side so anybody out there who can recommend any relevant books I would really appreciate it. I thought books on the 'Klu Klux Klan; might be insightful but any suggestions would be great.