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Russell Sage Foundation, 1967
Buku Teks
Chatburn, Robert L.
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Buku Teks
Garrett, Thomas M.
Prentice-Hall, 2001
Buku Teks
Drummond, Michael F.
Oxford University Press, 1989
Buku Teks
Drummond, Michael F.
Oxford Univesity Press, 1980
Buku Teks