1. Abcouwer, K., 2000. Soil bound carbon in the Ecuadorian páramo. Unpublished MSc thesis. University of Amsterdam.
2. Plio-Quaternary volcanism in Ecuador;Barberi;Geological Magazine,1988
3. Disaggregation and clay dispersion of Oxisols: Na resin, a recommended methodology;Bartoli;Geoderma,1991
4. The Nature and Properties of Soils;Brady,1999
5. Buytaert, W., 2004. The properties of the soils of the south Ecuadorian páramo and the impact of land use changes on their hydrology. Unpublished Ph.D. Thesis, Katholieke Universiteit Leuven.