Foulkes, David, 1924-, author
Butterworth, 1968
Buku Teks
Thompson, Brian
Black Stone Press Limited, 1997
Buku Teks
edited by Clauspeter Hill, Jochen Hoerth
Konrad-Adenauer-Stiftung, 2008
Buku Teks
Finn, Paul, author
Oxford University Press, 1987
Buku Referensi
ditulis oleh Prof. Dr. Philipus M. Hadjon, S.H. [and seven others]
Gadjah Mada University Press, 1999
Buku Teks