1. Aghion, Philippe and Peter Howitt, 1998, Endogenous Growth Theory. MIT Press, Cambridge.
2. Ahmad, Syed, 1991, Capital in Economic Theory: Neo-Classical, Cambridge, and Chaos. Aldershot: Elgar, UK.
3. Allais, Maurice, 1947, Économie et intérêt. Imprimerie National, Paris.
4. Arrow, Kenneth J., Hollis B. Chenery, B. S. Minhas and Robert M. Solow, 1961, “Capital-Labor Substitution and Economic Efficiency”, Review of Economics and Statistics 43: 225–248. Excerpted in Harcourt and Laing 1971.
5. Barro, Robert J. and Xavier Sala-i-Martin, 2004, Economic Growth. 2nd ed. MIT Press, Cambridge.