Ludwig, R. (1996). A manufacturing CEO's secret tips for improving profit. John Willey & Sons.
Lua i Stíl Chicago (17ú heag.)Ludwig, Richard. A Manufacturing CEO's Secret Tips for Improving Profit. New York: John Willey & Sons, 1996.
Lua MLA (9ú heag.)Ludwig, Richard. A Manufacturing CEO's Secret Tips for Improving Profit. John Willey & Sons, 1996.
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