Harris, Roy
Routledge, 1997
Buku Teks SO
Weber, Eugen
D.C. Heath, 1959
Buku Teks SO
Merryman, John Henry
Stanford University Press, 1969
Buku Teks
Merryman, John Henry
Stanford University Press, 1985
Buku Teks
Berman, Harold J.
Harvard University Press, 2003
Buku Teks SO