I find it shocking that out of eight million comments, the top book is only mentioned ~50 times, but the parent comment illustrates why -- many people mention title/author pairs without linking to the book itself.
Code: The Hidden Language of Computer Hardware and Software by Charles Petzold
(http://amzn.com/B00JDMPOK2)
Code: The Hidden Language of Computer Hardware and Software by Charles Petzold (http://amzn.com/B00JDMPOK2)