Artikel Jurnal
Guyer, Paul, author
Cambridge University Press, 2000
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1952
Buku Teks
Department Of social Affairs, 1950
Buku Teks
Russell, Bertrand, 1872-1970, author
Unwin Paperbacks, 1977
Buku Teks