The Elements of Law, Natural and Politic: Human Nature & De Corpore Politico

More accessible and condensed than the Leviathan. I recommend this to anyone who wants to understand the heart of Hobbes' philosophy.

A laborious study that the Founders of America relied heavily on. Not an easy read, but every word is necessary as Hobbes lays out his argument for liberty and how our perceptions color our societies and laws.