Social services in international perspective : the emergence of the sixth system / Kahn, Alfred J., 1919- ; Kamerman, Sheila B., joint author
[Washington] : U.S. Dept. of Health, Education, and Welfare, Social and Rehabilitation Service, Office of Planning, Research and Evaluation : for sale by the Supt. of Docs., U.S. Govt. Print. Off. , 1977