Europa Publications Limited, 1970
Buku Referensi
Europa Publications Limited, 1970
Buku Referensi
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1952
Buku Teks
Osborne, Milton
Allen & Uwin, 1994
Buku Teks
Coudenhove-Kalergi, Richard
Seewald Verlag, 1972
Buku Teks