Michael Anthony Lewis und Karl Widerquist, 2002. Economics for Social Workers: The Application of Economic Theory to Social Policy and the Human Services, New York: Columbia University Press[6]
Karl Widerquist, Michael Anthony Lewis und Steven Pressman (eds.), 2005. The Ethics and Economics of the Basic Income Guarantee, Aldershot, UK: Ashgate[7]
Karl Widerquist und Michael W. Howard (eds.) 2012. Alaska’s Permanent Fund Dividend: Examining its Suitability as a Model, New York: Palgrave Macmillan
Karl Widerquist und Michael W. Howard (eds.) 2012. Exporting the Alaska Model:Adapting the Permanent Fund Dividend for Reform around the World, New York: Palgrave Macmillan
Karl Widerquist, März 2013. Independence, Propertylessness, and Basic Income: A Theory of Freedom as the Power to Say No, New York: Palgrave Macmillan[8]
Karl Widerquist, Jose Noguera, Yannick Vanderborght und Jurgen De Wispelaere (eds.), Juli 2013. Basic Income: An Anthology of Contemporary Research, Oxford: Wiley-Blackwell
Karl Widerquist und Grant S. McCall. Prehistoric Myths in Modern Political Philosophy, Edinburgh: Edinburgh University Press, Januar 2017
Karl Widerquist, A Critical Analysis of Basic Income Experiments for Researchers, Policymakers, and Citizens, New York: Palgrave Macmillan, Dezember 2018
Karl Widerquist und Grant S. McCall. 2021. The Prehistory of Private Property, Edinburgh: Edinburgh University Press[9]