Heuer's Psychology Of Intelligence Analysis is a classic but it has actually been online since 1999. I know becasue that is when I first found it. Since the book went out of print, we have used the online version in our Advanced Intelligence Analysis class at Mercyhurst for at least the last 5 years. The book, I believe, is based on a series of tradecraft notes Heuer made for CIA analysts in the 1980's. My understanding is that Heuer is working on an updated edition.