Brenncke, Martin
Intersentia, 2018
eBooks
Wright, Charles Alan
West Publishing, 1970
Buku Teks
Klein, Mitchell S.G.
Prentice-Hall, 1984
Buku Teks
Wright, Charles Alan
West Publishing, [1983, ]
Buku Referensi
Jacob, Herbert, 1933-
Yale University Press, 1996
Buku Teks