1。Agricultural Intensification, Diversification, and Commercial Production among Smallholder Coffee Growers in Central Kenya Bryan Dorsey Economic Geography, Vol. 75, No. 2 (Apr., 1999), pp. 178-195 (article consists of 18 pages) Published by: Clark University
Stable URL: http://www.jstor.org/stable/144250
2。Livelihoods and farm efficiency in rural Georgia
Dirk Bezemer;  Kelvin Balcombe;  Junior Davis; Iain Fraser
Applied Economics, 1466-4283, Volume 37, Issue 15, 2005, Pages 1737 – 1745
http://www.informaworld.com/smpp/ftinterface?content=a723907184&rt=0&format=pdf

3.
Chavas, Jean-Paul, Petrie, Ragan and Roth, Michael J.,Farm Household Production Efficiency: Evidence from the Gambia. American Journal of Agricultural Economics, Vol. 87, No. 1, pp. 160-179, February 2005. Available at SSRN: http://ssrn.com/abstract=856476 or DOI: 10.1111/j.0002-9092.2005.00709.x
also http://papers.ssrn.com/sol3/papers.cfm?abstract_id=856476

4.A Shadow-Price Frontier Measurement of Profit Efficiency in Chinese Agriculture
Jirong Wang, Eric J. Wailes and Gail L. Cramer American Journal of Agricultural Economics, Vol. 78, No. 1 (Feb., 1996), pp. 146-156
(article consists of 11 pages) Published by: Blackwell Publishing on behalf of the Agricultural & Applied Economics Association Stable URL: http://www.jstor.org/stable/1243786