SPIEGEL, W. R. a. L. (1969). Industrial management.: 5th ed. Wiley & Sons.
Chicago-čujuhus (17. p.)SPIEGEL, William R. and LANSBURGH. Industrial Management.: 5th Ed. New York: Wiley & Sons, 1969.
MLA-čujuhus (9. p.)SPIEGEL, William R. and LANSBURGH. Industrial Management.: 5th Ed. Wiley & Sons, 1969.
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