Niebuhr, Reinhold, author
Charles Scribner's Sons, 1949
Buku Teks
Butterfield, H., author
Charles Scribner's Sons, 1950
Buku Teks
Robertson, John M., author
Watts & Co, 1931
Buku Teks
Niebuhr, Reinhold, author
Nisbet, 1947
Buku Teks
Leroux, Jean-Marie, author
Notre Dame, 1963
Buku Teks