Caspar David Friedrich im Atelier, Bildindex der Kunst und Architektur, Deutsches Dokumentationszentrum für Kunstgeschichte – Bildarchiv Foto Marburg, Philipps-Universität Marburg. Läst 27 april 2021.
canada.ca
Debra Daly Hartin, Wendy Baker (2018). Caring for paintings, Canadian Conservation Institute, Government of Canada. Läst 28 april 2021.
Flexible Supports, Materials Information and Technical Resources for Artists (MITRA), Department of Art Conservation, University of Delaware. Läst 27 april 2021.
Adhesives and Sizes, Materials Information and Technical Resources for Artists (MITRA), Department of Art Conservation, University of Delaware. Läst 27 april 2021.
Grounds and Primers, Materials Information and Technical Resources for Artists (MITRA), Department of Art Conservation, University of Delaware. Läst 27 april 2021.
