Sterba, James P.,, author
Thomson, 2003
Buku Teks
Rorty, Richard
Penguin Books, 1999
Buku Teks
Kukla, Andre, author
[publisher not identified], 2000
Buku Teks
Natanson, Maurice, author
Random House, 1963
Buku Teks
edited by Amitai Etzioni and Eva Etzi
Basic Books, 1964
Buku Teks