https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20023en.pdf
http://www.kavalacapital.com/content/20201201-Rapport_ecommerce.pdf
http://ec.europa.eu/social/main.jsp?catId=1143&intPageId=3193&langId=en/
http://www.bsa.natcen.ac.uk/latest-report/british-social-attitudes-34/key-findings/context.aspx?_ga=2.25464057.552181158.1498632950-1412959047.1496247036