Styan, J.L., author
Cambridge University Pres, 1977
Buku Teks
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1961
Buku Teks
Varga, Eugen, 1879-1964, author
Foreign Languages Publishing House, 1961
Buku Teks
Kohn, Hans, author
D. Van Nostrand, 1965
Buku Teks