APA-čujuhus (7. p.)
Gupta, B. C., & Walker, H. F. (2007). Statistical quality control for the Six sigma green belt. ASQ Quality Press.
Chicago-čujuhus (17. p.)
Gupta, Bhisham C., juo H. Fred Walker. Statistical Quality Control for the Six Sigma Green Belt. Milwaukee, Wisconsin: ASQ Quality Press, 2007.
MLA-čujuhus (9. p.)
Gupta, Bhisham C., juo H. Fred Walker. Statistical Quality Control for the Six Sigma Green Belt. ASQ Quality Press, 2007.
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