http://www.google.com/sidewiki/entry/jordi.guim/id/mDn6PICW68n-nKYBCtbLsI3XXoA
http://www.colegiosanignacio.edu.pe/abp/3/abps/botiquin/botiquin.HTML
http://projectesinterdisciplinaris.wordpress.com/2011/08/04/%C2%BFcuales-son-las-causas-y-soluciones-para-la-hambruna-en-africa/