Fernández-Luqueño, F., López-Valdez, F., Gamero-Melo, P., Luna-Suárez, S., Aguilera-González, E., Martínez, A., García-Guillermo, M., Hernández-Martínez, G., Herrera-Mendoza, R., Álvarez-Garza, M., & Pérez-Velázquez, I. (2013). Heavy metal pollution in drinking water - a global risk for human health: A review. African Journal of Environmental Science and Technology, 7(7), 567–584. https://doi.org/10.4314/ajest.v7i7.