Coudenhove-Kalergi, Richard
Seewald Verlag, 1972
Buku Teks
Routledge , 1996
Buku Teks
Gunther, John, 1901-1970, author
Harper & Brothers, 1961
Buku Teks
Gunther, John, 1901-1970, author
Harper & Brother, 1962
Buku Teks
Parker, R.A.C.
Weidenfeld and Nicolson, 1969
Buku Teks