1. Ackerman, F., & Heinzerling, L. (2004). Priceless: On knowing the price of everything and the value of nothing. New York: New Press.
2. Ackerman, F. (2008). Critique of cost-benefit analysis, and alternative approaches to decision-making—A report to friends of the Earth England, Wales and Northern Ireland.
3. Aldred, J. (2006). Incommensurability and monetary valuation. Land Economics, 82(2), 141–161.
4. Allan, W. (1949). Studies in African land usage in Northern Rhodesia. Rhodes Livingstone Papers, No. 15.
5. Allen, R. (1980). How to save the world. London: Kogan Page.