Chesterton, Gilbert Keith, 1874-1936, author
Cont Book, 1946
Buku Teks
Hoogland, Rob, author
Schelluinen, 2008
Buku Teks
Patten, Robert L., author
Cambridge University Press, 2012
Buku Teks
Tebbel, John William
Otterbein Press, 1963
Buku Teks
Niebuhr, Reinhold, author
Nisbet & Co., 1946
Buku Teks