Kendrick, J. W. (1980). Productivity in the United States: Trends and cycles. London: The Johns opkins University Press.
Παραπομπή Chicago StyleKendrick, John W. Productivity in the United States: Trends and Cycles. London: The Johns opkins University Press, 1980.
Παραπομπή MLAKendrick, John W. Productivity in the United States: Trends and Cycles. London: The Johns opkins University Press, 1980.
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