1. Europeana Homepage. https://www.europeana.eu/en. Accessed 08 Jun 2020
2. CEF Connecting Europe Facility Programme Website. https://ec.europa.eu/inea/en/connecting-europe-facility. Accessed 29 Oct 2020
3. KIK-IRPA, for Koninklijk Instituut voor het Kunstpatrimonium - Institut Royal du Patrimoine Artistique, is a federal scientific institute responsible for the documentation, study and conservation-restoration of the cultural and artistic heritage of Belgium. https://www.kikirpa.be/EN/. Accessed 08 Jun 2020
4. United Archives Homepage. https://united-archives.de/. Accessed 08 Jun 2020
5. Photoconsortium Homepage. https://www.photoconsortium.net/. Accessed 08 Jun 2020