Schefer, Krista Nadakavukaren
Edward Elgar Publishing, 2016
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Teks
Kauper, Paul G.
Little, Brown, 1971
Buku Teks
Dine, Janet
Blackstone Press, 1993
Buku Teks
Weatherill, Stephen
Blackstone Press Ltd., 1998
Buku Teks