Zelletin, Gerda
Bildungswerk Europaische Politik, 1973
Buku Teks
edited by John S. Major
Westview Press, 1986
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1961
Buku Teks
Boothe, Clare, author
G. Kolff, 1940
Buku Teks
Europa Publications LTD, 1929
Buku Teks