Seidman, L. W. (1989). Productivity: The american advantage. New York: Simon and Schuster.
Čikaški stil citiranjaSeidman, L. William. Productivity: The American Advantage. New York: Simon and Schuster, 1989.
MLA način citiranjaSeidman, L. William. Productivity: The American Advantage. New York: Simon and Schuster, 1989.
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