Stanford, Calif., Stanford University Press, 1973

Baltimore, Johns Hopkins Press 1971

London ; Orlando : Academic Press, 1984

Oslo, Universitetsforlaget, 1970

Dublin : Gill and Macmillan [for] the Economic and Social Research Institute, 1975

Cambridge, Mass. : MIT Press, 2000

Washington, Brookings Institution 1965

Cambridge [England] ; New York : Cambridge University Press, 1991

Washington, D.C. : Brookings Institution, 1981

New York, St. Martin's Press 1964