Rappaz, Michel
Springer-Verlag, 2003
Buku Teks SO
Shearer, J. Lowen
Prentice-Hall, 1997
Buku Teks SO
Martin lambert, Michael Leonard, Andrew Metcalfe
Taylor and Francis, 2009
Buku Teks SO
Woods, Robert L.
Prentice-Hall, 1997
Buku Teks SO
Kelly, S. Graham
CRC Press, 2009
Buku Teks SO