Wojciechowski, Jerzy A.
Council for research in values and philosophy, [Date of publication not identified]
Buku Teks SO
Ayer, Alfred Jules, 1910-1989
Penguin Books, 1956
Buku Teks SO
Morton, Adam
Blackwell, 1997
Buku Teks SO
Wilson, Edward O.
Alfred A. Knoff, 1998
Buku Teks SO
O`Brien, Dan
Polity Press, 2006
Buku Teks