edited by Hendry W. Ehrmann
Vakils, Fiffer and Simons, 1963
Buku Teks
Schulz, Ernest B
[publisher not identified], 1956
Buku Teks
Arblaster, Anthony, author
Open University Press, 1987
Buku Teks
Eisenstadt, S. N. (Shmuel Noah), author
The Woodrow Lilson Center Press, 1999
Buku Teks
Boix, Carles, author
Cambridge University Press, 2003
Buku Teks