File:GreenpaperonCitizenScience-1.pdf URL: https://ec.europa.eu/digital-single-market/en/news/green-paper-citizen-science-europe-towards-society-empowered-citizens-and-enhanced-research
Wayback Machine: http://web.archive.org/web/20170331232933/https://ec.europa.eu/digital-single-market/en/news/green-paper-citizen-science-europe-towards-society-empowered-citizens-and-enhanced-research