Porter, Charles O. (Charles Orlando), 1919-2006, author
Macmillan, 1961
Buku Teks
Cambridge University Press, 1997
eBooks
Berle, Adolf A., Jr., author
Harper & Row, [1962]
Buku Teks
MacEoin, Gary, author
P.J. Kenedy & Sons, 1963
Buku Teks
Pendle, George, author
Penguin Books, 1973
Buku Teks