MONSALVE CASTRO, L. M. et al. Freshwater: An analysis of an ecosystem service based on sustainability indicators. In: MONTENEGRO GÓMEZ, S. P.; ÁNGEL OSORIO, J. (Eds.). Ecosystem Services: An Introductory Approach with Experiences from Western Colombia. Agriculture, Livestock and Environment. Colombia,CO: Sello Editorial UNAD, 2019. p. 57–69.