Lamarque, Peter, author
Blackwell Publishing, 2009
Buku Teks
Sober, Elliott, author
Westview Press, 1993
Buku Teks
Hick, John H., 1922-2012, author
Prentice-Hall, 1990
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Russell, Bertrand, 1872-1970, author
National Book League, 1947
Buku Teks