Wadsworth, H. M., Stephens, K. S., & Godfrey, A. B. (1986). Modern methods for quality control and improvement. John Wiley.
Lua i Stíl Chicago (17ú heag.)Wadsworth, Harrison M., Kenneth S. Stephens, agus A. Blanton Godfrey. Modern Methods for Quality Control and Improvement. New York: John Wiley, 1986.
Lua MLA (8ú heag.)Wadsworth, Harrison M., et al. Modern Methods for Quality Control and Improvement. John Wiley, 1986.
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