Mills, Edwin S.
W.W. Norton, 1978
Buku Teks SO
American Enterprise Institute for Public Policy Research, 1972
Buku Teks SO
Nijkamp, Peter
North-Holland Publishing, 1977
Buku Teks SO
Common, Michael
Addison Wesley Longman, 1996
Buku Teks SO
Turner, R. Kerry
Harvester Wheatswheaf , 1994
Buku Teks SO