edited by John Cottingham
Blackwell, 2008
Buku Teks
Hales, Steven D.
Wiley Balckwell, 2013
Buku Teks
Maritain, Jacques, 1882-1973
Rowman & Littlefield Publishers, 2005
Buku Teks
Cahn, Steven M.
Harper & Row, 1971
Buku Teks
Rachels, James, 1941-2003
McGraw-Hill, 2012
Buku Teks