The Marshmallow Test: Mastering Self Control, by Walter Mischel, is not a self-help book and will not help you increase your willpower. It is a detailed account of the initial experiment the author conducted in the 1960s, the findings, evolution, and influence on society. There are some practical suggestions and tips recommended; however, this is not the focus of the book. If you enjoy reading about scientific studies, you will be highly entertained. I would recommend this to the science nerd, not the type-A what-should-I-do-and-eat seeker.
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Mischel, W. (2014). The marshmallow test: Mastering self-control. New York: Little, Brown and Company.