To claim the copyright of any work, one needs legal documented proof from a government copyright office. (writingbytheseatofmypants.com)
You may or may not choose to copyright your book through your local copyright office. (goodlifeguide.com)
With the U.S. Copyright Registration service, Archway Publishing will complete and submit the necessary paperwork to the U.S. Copyright Office with a copy of your book. (archwaypublishing.com)