Feldman, Fred
McGraw-Hill, 1986
Buku Teks
Hales, Steven D., author
Wiley Balckwell, 2013
Buku Teks
Maritain, Jacques, 1882-1973, author
Rowman & Littlefield Publishers, 2005
Buku Teks
Cahn, Steven M., author
Harper & Row, 1971
Buku Teks
Flew, Antony
Thames and Hudson , 1989
Buku Teks