Snedecor, George W.
Statistical methods
The Iowa State University Press, 1950
 Buku Teks SO
Snedecor, George W.
Statistical methods
Iowa State University Press, 1989
 Buku Teks SO
Snedecor, George W.
Statistical methods
The Iowa State University Press, 1982
 Buku Teks SO
Snedecor, George W.
Statistical methods
The Iowa State University Press, 1980
 Buku Teks SO
Bissell, Derek
Statistical methods for SPC and TQM
Chapman & Hall, 1994
 Buku Teks SO