Catt, Helena
Democracy in practice
Routledge , 1999
 Buku Teks
Drucker, Peter Ferdinand, 1909-2005
The practice of management
Pan Books, 1982
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Habermas, Jurgen
Theory and Practice
Heinemann, 1974
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Elton, Geoffrey Rudolph
The practice of history
Sydney University Press, 1967
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Seelye, Elwyn E.
Field practice
New York: John Wiley & Sons, 1954
 Buku Teks