Everything you need to get started drawing from life. The book starts with philosophical ideas, progresses to the actual principles that work, and continues on with exercises to help you hone your skills. If you've never attempted a serious drawing, this book will guide you. This book is designed to give you the tools to get you speaking the language with competence as efficiently as possible. It is a complete guide for the beginner as well as a way to shore up the fundamentals for the established artist.
A really good little known book about drawing. To the point, bullshit free, pretty good on the "learning how to learn" part, too. It also features a useful list of general exercises to avoid the "I want to draw but I don't know what" moments.
If you need a recap of some fundamentals try this one. The author gives it away for free on a popular art forum, look for it if you want to take a peek first.