National Productivity Corporation. (2001). A glossary of productivity and quality terminologies. National Productivity Corporation.
Citace podle Chicago (17th ed.)National Productivity Corporation. A Glossary of Productivity and Quality Terminologies. Petaling Jaya: National Productivity Corporation, 2001.
Citace podle MLA (8th ed.)National Productivity Corporation. A Glossary of Productivity and Quality Terminologies. National Productivity Corporation, 2001.
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