Presidency of the Council of Ministers of the Republic of Italy, Information Service, 1962
Buku Teks
Rossiter, Clinton, 1917-1970
The American Library, 1960
Buku Teks
Schubert, Glendon A., Jr
University of Minnesota Press, 1956
Buku Teks
Longaker, Richard P.
Cornell University Press, 1962
Buku Teks
Scigliano, Robert
The Free Press, 1971
Buku Teks