edited by Alberto Perez-Gomez and Stephen Parcell
McGill-Queen's U Prees, 1994
Buku Teks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
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