Amsden, D. M., Butler, H. E., & Amsden, R. T. (1991). SPC simplified for services: Practical tools for continuos quality improvement. Chapman and Hall.
Citace podle Chicago (17th ed.)Amsden, Davida M., Howard E. Butler, a Robert T. Amsden. SPC Simplified for Services: Practical Tools for Continuos Quality Improvement. Londres: Chapman and Hall, 1991.
Citace podle MLA (9th ed.)Amsden, Davida M., et al. SPC Simplified for Services: Practical Tools for Continuos Quality Improvement. Chapman and Hall, 1991.
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