D. R. Bothe (1997). Measuring Process Capability. McGraw-Hill.
J.A. Clements (1989). "Process Capability Calculations for Non-Normal Calculations", Quality Progress, 22, 95–100.
J.R. English and G.D. Taylor (1996). "Process Capability Analysis--A Robustness Study", International Journal of Product Research, 31, 1621–1635.
N.R. Farnum (1996). "Using Johnson Curves to Describe Non-Normal Process Data". Quality Engineering, 9, 339–345.
M.J. Harry (1997). The Vision of Six Sigma: Tools and Methods for Breakthrough, TriStarPublishing.
M.J. Harry and J.R. Lawson. (1992). Six Sigma Producibility Analysis and Process Characterization. Addison-Wesley.
D. W. McCormack Jr., I.R. Harris, A.M. Hurwitz, and P.D. Spagon (2000). "Capability Indices for Non-Normal Data", Quality Engineering, 12, 489–495.
T. Pyzdek (1992). "Process Capability Analysis Using Personal Computers", Quality Engineering, 4, 419–440.
R.N. Rodriguez (1992). "Recent Developments in Process Capability Analysis", Journal of Quality Technology, 24, 176–186.
S.E. Somerville and D.C. Montgomery (1996). "Process Capability Indices and Non-Normal Distributions", Quality Engineering, 9, 305–316.