Boas, Gideon, author
Northampton, Mass. : Edward Elgar, 2012
Buku Teks
Brownlie, Ian, author
Oxford University Press, 1966
Buku Teks
Nelson, Gideon E.
Buku Teks
Drews, Jurgen
Roches, 1990
Buku Teks
Bearden, William O., author
McGraw-Hill, 2001
Buku Teks