The Emotional Incest Syndrome: What to Do When a Parent's Love Rules Your Life by Dr. Patricia Love

It was copyrighted 1990, so was pretty cheap off Ebay. 

I wanted to share that I found this great book dealing with unhealthy parental boundaries (not sexual incest, just unhealthy boundaries). Written by a therapist who provides lots of examples from her own counseling sessions and is written in easy to understand, commen sense language.