Hellerstein, J., Newmark, D., & Trocke, K. R. (1996). Wages, productivity, and worker characteristics: Evidence from plant-level production functions and wage equations. National Bureau of Economics.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hellerstein, J.K, David Newmark, و Kenneth R. Trocke. Wages, Productivity, and Worker Characteristics: Evidence from Plant-level Production Functions and Wage Equations. Cambridge: National Bureau of Economics, 1996.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Hellerstein, J.K, et al. Wages, Productivity, and Worker Characteristics: Evidence from Plant-level Production Functions and Wage Equations. National Bureau of Economics, 1996.
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