Childers, Kristen Stromberg, author
Oxford University Press, 2016
eBooks
Carrington, Selwyn H.H., author
Foris Publications, 1988
Buku Teks
Pollard, Velma
Longman, 1994
Buku Teks
Delvolve, Jean-Louis
Kluwer law and Taxation Publishers, 1982
Buku Teks
Driver, Harold E., author
University of Chicago Press, 1961
Buku Teks