Cahn, Steven M., author
Harper & Row, 1971
Buku Teks
Hales, Steven D., author
Wiley Balckwell, 2013
Buku Teks
Maritain, Jacques, 1882-1973, author
Rowman & Littlefield Publishers, 2005
Buku Teks
Flew, Antony
Thames and Hudson , 1989
Buku Teks
Brennan, Joseph Gerard, author
Harper & Row, 1967
Buku Teks