Woodrow Barfield 
Fundamentals of Wearable Computers and Augmented Reality [PDF ebook] 

Data will not help you if you can’t see it where you need it. Or can’t collect it where you need it. Upon these principles, wearable technology was born. And although smart watches and fitness trackers have become almost ubiquitous, with in-body sensors on the horizon, the future applications of wearable computers hold so much more. A trusted refer