edited by Andrew Blowers, Chris Hammett and Philip Sarre
Hutchinson Educational in association with the Open University Press, 1974
Buku Teks SO
edited by Richard Sennett
Appleton-Century-Crofts, 1969
Buku Teks SO
Orum, Anthony M.
Blackwell, 2003
Buku Teks SO
Mercer, Charles
Penguin Books, 1975
Buku Teks SO
edited by Nick Jewson and Susanne Macgregor
Routledge, 1997
Buku Teks SO