Elkington, John The power of unreasonable people : how social entrepreneurs create markets that change the world / - Boston, Mass. : Harvard Business School Press, c2008 - xviii, 242 p. ; 25 cm ISBN: 9781422104064 1422104060 Subjects--Topical Terms: Social entrepreneurshipSocial change Dewey Class. No.: 361 HAR 2008 A114 Or.