Martinus Nijhoff , 1987
Buku Teks
Jurnal Kajian Wilayah Eropa Vol. 4 No. 3 2008: 91-106, 2008
Artikel Jurnal
Council of Europe
Martinus Nijhoff Publishers, 1990
Buku Referensi
Selby, David
Cambridge University Press, 1988
Buku Teks
edited by James C. Tuttle
American Bar Association, 1978
Buku Teks