V. Amirzadeh, M. Mashinchi, A. Parchami, Construction of p-charts using degree of nonconformity, Information Sciences, 179(2) (2009), 150-160.
 A. C. Cullen, H. C. Frey, C. H. Frey, Probabilistic techniques in exposure assessment, Springer Science and Business Media, New York, 1st edition, 1999.
 D. C. Montgomery, Introduction to statistical quality control, John Wiley and Sons, New York, 2001.
 A. Parchami, M. Mashinchi, A new generation of process capability indices, Journal of Applied Statistics, 37(1) (2010), 77-89.
 A. Parchami, B. Sadeghpour-Gildeh, M. Mashinchi, Why fuzzy quality?, International Journal for Quality Research, 10(3) (2016), 457-470.
 W. L. Pearn, S. Kotz, Encyclopedia and handbook of process capability indices: A comprehensive exposition of quality control measures, World Scientific, Singapore, 2006.
 B. Sadeghpour Gildeh, Comparison of Cp, Cpk and Cp-tilde process capability indices in the case of measurement error occurrence, IFSA World Congress, Istanbul, Turkey, (2003), 563-567.
 L. Scrucca, qcc: An R package for quality control charting and statistical process control, R. News, 4(1) (2004), 11-17.
 C. Yongting, Fuzzy quality and analysis on fuzzy probability, Fuzzy Sets and Systems, 83 (1996), 283-290.
 L. A. Zadeh, Probability measures of fuzzy events, Journal of Mathematical Analysis and Applications, 23(2) (1968), 421-427.