Basic Drawing by Charles Williams is an introductory book to drawing. It's about observational drawing with instructions and exercises.
The book's written with a more academic approach and can be quite draggy. That's exactly the same complaint I have with the author's other book called Basic Watercolour: How to Paint What You See.
Personally I would have preferred a much hands on approach rather than one with lengthy text explanation. There are some good exercises but none too inspiring looking though.
If you want a better book on sketching or observational drawing, check out Keys to Drawing.
Visit Amazon to check out more reviews.
If you buy from the links, I get a little commission that helps me get more books to feature.