The Science of Being an Introvert

I've read a few, OK, books on the subject, but I don't know which to recommend. I was originally inspired to read further on this after reading Carl King's article: 10 Myths About Introverts. None of these books are perfect, however, The Introvert Advantage, by Marti Olsen Laney, Psy.D. was one that really opened my eyes to the neurological and genetic differences between introverts and extroverts. This will be a partial review of the physical science in it and my own conjecture based on personal experience and education.