Zúñiga Ugalde, F. 2019. Essential of Soil Science: Soil Formation, Functions, Use and Classification (World Reference Base, WRB). 2018. Borntraeger Science Publishers, Stuttgart, Germany. 171 p. (101 figuras, 22 tablas). Agro sur. 47, 1 (abr. 2019), 3–4. DOI:https://doi.org/10.4206/agrosur.2019.v47n1-02.