edited by Dennis Alan Mann
Popular Press, 1977
Buku Teks SO
The Council for Research in Values and Philosophy, 2005
Buku Teks
Levitan, David M.
Academy of Political Science, 1946
Buku Teks
Levitan, David M.
Academy of Political Science, 1946
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Hall, Jerome, author
The Bobbs-Merrill, 1949
Buku Teks