4G. A. Cohen, "Illusions about Private Property and Freedom", Issues in Marxist Philosophy, Vol. IV: Social and Political Philosophy, edited by John Mepham and David Hillel Ruben, N.J. Humanitis Press, 1979, pp. 223 -242.
5Ian Carter, A Measure of Freedom, Oxford University Press,1999, pp. 248 - 258, pp. 257 - 258.
6John Cohen, "Against Cohen on Proletarian Unfreedom" ,Social Philosophy and Policy, 6( 1988), p. 192.