Happiness and self-help: Robin et al., Your Money or Your Life: 9 Steps to Transforming Your Relationship with Money and Achieving Financial Independence (also known as YMOYL in the simplicity community).

This book outlines how economics affects and mingles with life purpose and provides specific tips on how to set and achieve your life's goals within the framework of human society. It's what set me on the path toward thinking in the terms of Givewell and charity, and the long-term survival of the human race, and also what sort of job and retirement goals I should have. It covers a wide range of topics, is extremely well written and engaging, and provides lots and lots of specific advice.

The only detriment I can think is that the authors are somewhat spiritual and depend heavily on anecdotes, but I found those things easy to discard, as they put everything in the terms of what you want out of life: an individual extrapolated volition. For a time, I called this book my bible.