London : Pancy Lund Humpries
Majalah, Jurnal, Buletin
Scalapino, Robert A., author
American Enterprise Institute for Public Police, 1972
Buku Teks
edited by Herbert J. Ellison
Westview Press, 1987
Buku Teks
Cornell University Press, 1969
Buku Teks
Myung, Hyun Cho, author
Seoul Computer Press, 1989
Buku Teks