Berkhofer, robert F
The Free press, 1969
Buku Teks
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
Burke, Peter, author
Stanford University Press, 1990
Buku Teks