The Practical Encyclopedia of Drawing: Pencils, pens and pastels - observing and measuring - perspective - shading - line drawing - sketching - texture - using negative spaces - composition by Ian Sidaway
From graphite pencils and charcoals to soft pastels and crayons the art of drawing encompasses a variety of mediums and techniques all of which are comprehensively covered in this beautiful book.
Got this book from a friend and have read through parts of it several times. I've done some of the drawings, and used a few of the techniques included. I think it's pretty beneficial for beginners and seasoned artists that could use a few pointers or a refresher.