Garraghan, Gilbert J., author
Fordham University Press, 1957
Buku Teks
McDowell, W. H., author
Longman, 2002
Buku Teks
Brundage, Anthony, 1938-, author
John Wiley & Sons, Inc., 2018
Buku Teks
Gower, Barry
Routledge, 1997
Buku Teks
Renier, G.J., author
Harper and Row, 1965
Buku Teks