Crosby, P. B. (1979). Quality is free: The art of making quality certain. McGraw-Hill.
Citace podle Chicago (17th ed.)Crosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: McGraw-Hill, 1979.
Citace podle MLA (9th ed.)Crosby, Philip B. Quality Is Free: The Art of Making Quality Certain. McGraw-Hill, 1979.
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