1. Acquaye, A. K. A. 2000. “Parametric and Nonparametric Measures of State-Level Productivity Growth and Technical Change in U.S. Agriculture: 1949–1991.” Unpublished Ph.D. Dissertation, Department of Agricultural and Resource Economics, University of California, Davis.
2. Ahearn, M., J. Yee, V. E. Ball, and R. Nehring. 1998. “Agricultural Productivity in the
3. United States.” Agricultural Information Bulletin No. 740, Economic Research Service, U.S. Department of Agriculture.
4. Alston, J. M., G W. Norton, and P. G. Pardey. 1995. Science Under Scarcity: Principles and Practice for Agricultural Research Evaluation and Priority Setting. Ithaca: Cornell University Press.
5. ESCS Technical Bulletin;American Agricultural Economics Association (AAEA),1980