Romero-Morales, M. Ángel et al. 2011. Sustainability of two production systems of brown sugar cones in indigenous communities of the central region in the Huasteca Potosina. Revista de Geografía Agrícola. 46-47 (Dec. 2011), 73–86. DOI:https://doi.org/10.5154/r.rga.2011.46-47.04.