Masterful Color, Vibrant Colored Pencil Paintings, Layer by Layer by Arlene Steinberg, hardback published by North Light in the USA. Available in the UK, ISBN 978-1-58180-957-2, price 18.99 from www.davidandcharles.co.uk
This is a very good book for learning to use coloured pencils and improving your technique. I have seen others use the same layering and burnishing techniques, so their is nothing unique in that, but the paintings are vibrant and beautiful. The 15 demonstrations are worth following, there is a lot of useful information here. Good variety of subjects painted too.