Gunther, John, 1901-1970, author
Harper & Brother, 1962
Buku Teks
Parker, R. A. C.
Weidenfeld and Nicolson, 1969
Buku Teks
Europa Publications Limited, 1970
Buku Referensi
Europa Publications Limited, 1970
Buku Referensi
Coudenhove-Kalergi, Richard
Seewald Verlag, 1972
Buku Teks