- Drawing Realistic Texture in Pencil
http://www.scribd.com/doc/13929369/drawing
- Pencil Drawing Techniques - David Lewis
http://www.scribd.com/doc/13912832/david-lewis-pencil-drawing-techniques
- The Art of Basic Drawing
http://www.scribd.com/doc/9009211/The-Art-of-Basic-Drawing
- Teach your self (VISUALLY Drawing)
http://www.4shared.com/get/113424136/9363b4b0/VISUALLY_Drawing.html