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Basher, Reid (15 de agosto de 2006). «Global early warning systems for natural hazards: systematic and people-centered». Philosophical Transactions of the Royal Society364 (1845): 2167-2182. Bibcode:2006RSPTA.364.2167B. PMID16844654. doi:10.1098/rsta.2006.1819.
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Basher, Reid (15 de agosto de 2006). «Global early warning systems for natural hazards: systematic and people-centered». Philosophical Transactions of the Royal Society364 (1845): 2167-2182. Bibcode:2006RSPTA.364.2167B. PMID16844654. doi:10.1098/rsta.2006.1819.
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Nations, United. «Early Warning Systems». United Nations(en inglés). Consultado el 19 de abril de 2021.