For anyone seriously interested in a comprehensive book written for the layperson on the ABC link, then I must recommend Dr. Chris Kahlenborn, M.D.
Click the title to get to Amazon.
This book is written in an easy to follow format, with attention paid to every aspect of the debate. Written in 2,000, it predates the Brinton farce at NCI, but don’t let that deter you. This book needs to be on everyone’s shelf.