Schmitz, Patrice-Emmanuel (30 September 2021). European Union Public Licence (EUPL) Guidelines July 2021 — NO-08-21-281-EN-N. Brussels, Belgium: Directorate-General for Informatics, European Commission. doi:10.2799/77160. ISBN978-92-76-41527-5. Landing page.
Schmitz, Patrice-Emmanuel (30 September 2021). European Union Public Licence (EUPL) Guidelines July 2021 — NO-08-21-281-EN-N. Brussels, Belgium: Directorate-General for Informatics, European Commission. doi:10.2799/77160. ISBN978-92-76-41527-5. Landing page.