Stuvel, G., author
System of social accounts
Clarendon Press, 1965
Buku Teks
Burns, Eveline M.
The American social security system
Houghton Miffiln, 1949
Buku Teks
Sanders, Irwin T.
The Community: an introdustion to a social system
The Ronald Press, 1958
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Juric, Dusan
State and social system of Yugoslavia by and
Beograd, Yugoslavija [t.th.] [t.p.]
Buku Teks
The American social security system
Buku Teks
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