Gamboa, N. «HESTER, R.E Y R.M. HARRISON. Minning and Its Environmental Impact. Cambridge: The Royal Society of Chemistry, 1994 (Issues in Environmental Science and Technology, Nro. 1»). Revista De Química, Vol. 11, n.º 1, Apr. 1997, p. 124, https://revistas.pucp.edu.pe/index.php/quimica/article/view/5301.