Trachtman, Joel P., author
Cambridge University Press , 2013
Buku Teks
Bennett, A. LeRoy, author
Prentice-Hall, 1977
Buku Teks
McWhitney, Edward, author
Sijthoff & Noordhoff , 1979
Buku Teks
Weber, Ludwig
Wolters Kluwer, 2007
Buku Teks
Universitaire Pers Leiden, 1950
Buku Teks