Barbier, E. B., Acreman, M., & Knowler, D. (1997). Economic valuation of wetlands: A guide for policy makers and planners. Ramsar Convention Bureau.
Citazione stile Chigago Style (17a edizione)Barbier, Edward B., Mike Acreman, e Duncan Knowler. Economic Valuation of Wetlands: A Guide for Policy Makers and Planners. Gland, Switzerland: Ramsar Convention Bureau, 1997.
Citatione MLA (9a ed.)Barbier, Edward B., et al. Economic Valuation of Wetlands: A Guide for Policy Makers and Planners. Ramsar Convention Bureau, 1997.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.