Social Contract: Essays by Locke, Hume, and Rousseau.

A 38 page introduction by Barker; "An Essay Concerning the True Original, Extent and End of Civil Government" by <a href=http://openlibrary.org/authors/OL77200A>John Locke</a>; "Of the Original Contract" by <a href=http://openlibrary.org/authors/OL29349A>David Hume</a>; "The Social Contract" by <a href=http://openlibrary.org/authors/OL29048A>Jean-Jacques Rousseau</a>.