https://www.hende-i-medio-ambiente.org/wp-content/uploads/2021/02/wpiea2020286-print-pdf.pdf
https://www.esri.ie/system/files/publications/SUSTAT118.pdf
http://www.cobcoe.eu/files/cobcoe-brexit-report-september-2017-e-Y4G2st.pdf
https://theconversation.com/es-rentable-ser-etico-en-la-empresa-234405