The Practical Encyclopedia of Drawing: Pencils, pens and pastels - observing and measuring - perspective - shading - line drawing - sketching - texture - using negative spaces - composition
Packed with practical and artistic advice and tips, and with over 750 step-by-step photographs, this reference book is a must for both complete beginners and more experienced artists looking for inspiration.
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.