Tatiana Valentine Guy, Miroslav Karny, David H. Wolpert, editors
[Springer, ], 2012
eBooks
Alkin, Marvin C., author
Sage, 1985
Buku Teks
Dingle, J.
Arnold , 1997
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Porter, Gary A., 1950-, author
South-Western, 2001
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Behn, Robert D., author
Basic Books, 1982
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