Department of Information, 1984
Buku Teks
edited by Eric Oey
APA Publications , 1990
Buku Referensi
Dalton, Bill, author
Odyssey Guides , 1991
Buku Referensi
Zelletin, Gerda
Bildungswerk Europaische Politik, 1973
Buku Teks
Speed, F.W.
Angus and Robertson , 1971
Buku Teks