Why We Need Needs-Based Justifications of Human RightsCharles R. Beitz, The Idea of Human Rights (Oxford: Oxford University Press, 2009), 256 pp., £16.99/$29.95 cloth.James Griffin, On Human Rights (Oxford: Oxford University Press, 2008), 360 pp., £17.99/$29.95 paper.Beth A. Simmons, Mobilizing for Human Rights: International Law in Domestic Politics (Cambridge: Cambridge University Press, 2009), 468 pp., £20.99/$29.99 paper.