Garrod, G., & Willis, K. G. (2001). Economic valuation of the environment: : methods and case studies (ed. repr.). Cheltenham: Edward Elgar.
Cita MLA (8 ed.) (Copiar al portapapeles)Garrod, Guy, and Kenneth G Willis. Economic Valuation of the Environment: : Methods and Case Studies. ed. repr. Cheltenham: Edward Elgar , 2001.