2 Emerton, L. (Ed.) 2005. Values and rewards: Counting and capturing ecosystem water services for sustainable development. Colombo, Sri Lanka: International Union for Conservation of Nature (IUCN). 93p. (IUCN water, nature and economics technical paper no.1)
3 Emerton, L. (Ed.) 2005. Values and rewards: counting and capturing ecosystem water services for sustainable development. Colombo, Sri Lanka: International Union for Conservation of Nature (IUCN), Ecosystems and Livelihoods Group Asia. 93p.