Robbins, Peter T., editor
Springer, 2011
eBooks
Gert Pickel
VS Verlag, 2012
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Kozielski, Robert, author
Emerald, 2017
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Hertzman, Clyde
DC The International Bank for Reconstruction and Development , 1995
Buku Teks
edited by Andrew Blasko, Diana Januauskiene
Council for Research in Values and Philosophy, 2008
Buku Teks