Nash, Walter
J.M. Dent & Sons, 1945
Buku Teks SO
edited by Tinatin Bocorivili; Sweet William; Daniel Ahern
Council for Research in Values and Philosophy, 2005
Buku Teks SO
Mulgan, Richard
Oxford University Press, 1989
Buku Teks SO
Lalonda, Marc
0, 1974
Buku Teks
edited by Jan De Leede
Emerald, 2017
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