Ostrom, Vincent
University of Michigan Press, 1997
Buku Teks
Padover, Saul K. (Saul Kussiel)
Frederick A. Praeger, 1963
Buku Teks
Schulz, Ernest B
[publisher not identified], 1956
Buku Teks
Arblaster, Anthony
Open University Press, 1987
Buku Teks
Eisenstadt, Shmuel Noah
The Woodrow Lilson Center Press, 1999
Buku Teks