Hales, Steven D., author
Wiley Balckwell, 2013
Buku Teks
Maritain, Jacques, 1882-1973, author
Rowman & Littlefield Publishers, 2005
Buku Teks
Randall, John Herman, author
Barnes & Noble, 1957
Buku Teks
Brightman, Edgar Sheffield
Holt, Rinehart and Winston, 1961
Buku Teks
Patrick, George Thomas White, author
George Allen and Unwin, 1925
Buku Teks