Ludwig, R. (1996). A manufacturing CEO's secret tips for improving profit. John Willey & Sons.
Cita Chicago (17th ed.)Ludwig, Richard. A Manufacturing CEO's Secret Tips for Improving Profit. New York: John Willey & Sons, 1996.
Cita MLA (9th ed.)Ludwig, Richard. A Manufacturing CEO's Secret Tips for Improving Profit. John Willey & Sons, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.