1. Allen , R.C. 2005 English and Welsh agriculture, 1300-1850: outputs, inputs, and income
2. Anand , S. Sen , A.K. 1997 Concepts of human development and poverty: a multidimensional perspective
3. Mostly Harmless Econometrics
4. Dynamics and stagnation in the Malthusian epoch;Ashraf;American Economic Review,2011