Levitan, S. A., & Werneke, D. (1984). Productivity: Problems, prospects, and policies. Baltimore: The Johns Hopkins University Press.
Παραπομπή Chicago StyleLevitan, Sar A., and Diane Werneke. Productivity: Problems, Prospects, and Policies. Baltimore: The Johns Hopkins University Press, 1984.
Παραπομπή MLALevitan, Sar A., and Diane Werneke. Productivity: Problems, Prospects, and Policies. Baltimore: The Johns Hopkins University Press, 1984.
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