Shannon, Thomas A.
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Buku Teks
Holland, Stephen, 1963-
Polity Press, 2017
Buku Teks
Garrett, Thomas M.
Prentice-Hall, 2001
Buku Teks
Beyleveld, Deryck
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Buku Teks
Ruth Chadwick, Henk ten Have and Eric M. Meslin
Sage, 2011
Buku Teks