BARRERA BERDUGO, S. E. et al. An Introduction to the Current State of Ecosystem Services in Western Colombia. 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. 20–34.