Here you can find the sites I’ve used when I’ve need to research an issue. You can decide a site’s credibility, and therefore, mine, for yourself! 🙂
The site I used mainly to establish the basic signs of Parental Alienation: http://www.parental-alienation.info/publications/24-sigofparalisynandhowtocouitseff.htm
The quote from Bill Russell in my “The Beginning of BM” blog is from his book Second Wind: The Memoirs of an Opinionated Man.