Badie, Bertrand, author
University of Chicago Press, 1983
Buku Teks
Barnes & Noble Books, 1969
Buku Teks
R. Vassilev
Publishing House of the Bulgaria, 1970
Buku Teks
Zanden, James W. Vander, author
McGraww-Hill, 1996
Buku Teks
Caplow, Theodore
Prentice-Hall, 1971
Buku Teks