The AdSense Code: What Google Never Told You About Making Money with AdSense is a book written by an Internet marketing expert Joel Comm. This book was published in April 2006. The cover of the book is based on the famous book "Da Vinci Code" of Dan Brown(see picture above). The book covers the story of Joel Comm raising his adsense revenue from $3 per day to 600$/day. You can find details on how adsense works and how to increase adsense clicks, revenue etc in this book.