Coudenhove-Kalergi, Richard
Seewald Verlag, 1972
Buku Teks
Rothman, Stanley
Bobbs-Merril Company, 1970
Buku Teks
Linz, Juan J., author
Johns Hopkins University Press, 1978
Buku Teks
Camus, Albert, 1913-1960, author
Alfred A. Knopf, 1960
Buku Teks
Childs, Harwood Lawrence
Princeton University Prees , 1936
Buku Teks