What are some recommended books on decision theory for someone looking to deepen their understanding of the subject?

Some recommended books on decision theory for those looking to deepen their understanding of the subject include "Thinking, Fast and Slow" by Daniel Kahneman, "The Art of Choosing" by Sheena Iyengar, and "Nudge: Improving Decisions About Health, Wealth, and Happiness" by Richard H. Thaler and Cass R. Sunstein.