Kluwer Law International, 1997
Buku Teks
Clark, R.B., author
Clarendon Press, 1986
Buku Teks
Stephanus Munadjat Danusaputro, author
Binacipta, 1981
Buku Teks
Harvest House, 1968
Buku Teks
Davenport, S.J.
Washington, DC: United States Department of the Interior, 1954
Buku Teks