What are some books that Rachel recommends?

For further reading, here are some of the books that Rachel makes reference to:

For Books referenced in Girl, Stop Apologizing:

Well Behaved Women Seldom Make History, by Laurel Thatcher Ulrich

The One Thing, by Gary Keller and Jay Papasan

For Books Referenced in Girl, Wash Your Face:

The Power of Habit, by Charles Duhigg