Mehren, Arthur Taylor von, author
Little,Brown and Company, 1957
Buku Teks
Blanpain, Roger (et.al.)
Cambridge University Press, 2007
Buku Teks
Davidson, Kenneth M., author
West Publishing Company, 1974
Buku Teks
Gustafson, Charles H.
West Publishing Co., 1997
Buku Teks
Kur, Annette, author
Edward Elgar, 2013
Buku Teks