Balvanera, P., S. Quijas, D. S. Karp, N. Ash, E. M. Bennett, R. Boumans, C. Brown, K.M.A. Chan, et al. (2016). Ecosystem services. The GEO Handbook on Biodiversity Observation Networks. M. Walters and R. J. Scholes. Cham, Switzerland, Springer Open: 39-78. url