Avery, William Alexander; Francis, Charles (22 May 2013). "The wealth of nature: economics as if survival mattered". International Journal of Agricultural Sustainability. 12 (1): 89–91. doi:10.1080/14735903.2013.796766. S2CID153857265.
Avery, William Alexander; Francis, Charles (22 May 2013). "The wealth of nature: economics as if survival mattered". International Journal of Agricultural Sustainability. 12 (1): 89–91. doi:10.1080/14735903.2013.796766. S2CID153857265.