Suchman, Edward A.
Russell Sage Foundation, 1967
Buku Teks SO
Chatburn, Robert L.
Jones & Bartlett Learning, 2011
Buku Teks SO
Garrett, Thomas M.
Prentice-Hall, 2001
Buku Teks SO
Drummond, Michael F.
Oxford Univesity Press, 1980
Buku Teks
Drummond, Michael F.
Oxford University Press, 1989
Buku Teks