The next book on my summer reading list was Quiet: The Power of Introverts in a World That Can't Stop Talking by Susan Cain.
This was a hard book for me to get through. A bit too much analyzing while not offering new insight.
I honestly believe most of us are "ambiverts" (those who exhibit both extrovert and introvert qualities) and this type was not discussed in detail.
I did find several quotes that resonated with me,
"Don't think of introversion as something that needs to be cured."
"We have two ears and one mouth and we should use them proportionally."