Here are some of the drawing books that I've started to skim through already.
They're all surprisingly different to each other so it's quite nice to have a wide range of books.
Basic Drawing Made Amazingly Easy - Christopher Hart
Drawing From the Right Side of the Brain - Betty Edwards
Freehand Drawing & Sketching - K.C. Heuser
Pencil Drawing Techniques - David Lewis
Perspective Made Easy - Ernest Norling
The Complete Book of Drawing Techniques - Peter Stanyer