APPH. - Associação Portuguesa de Photographia: http://apphotographia.blogspot.pt/
Autochromes Lumière: http://www.autochromes.culture.fr/
Bibliothèque Nationale de France (BNF): http://www.bnf.fr
BiuSanté: http://www.bium.univ-paris5.fr/
Cabinet of Art and Medicine: http://www.artandmedicine.com/
Casa-Estúdio Carlos Relvas: http://www.casarelvas.com/
Centro Português de Fotografia: http://www.cpf.pt
Daguerreian Society: http://www.daguerre.org/
Database of Scientific Illustrators 1450-1950: http://www.uni-stuttgart.de/hi/gnt/dsi2/
Fundação da Casa de Bragança: http://www.fcbraganca.pt/
George Eastman House: http://www.eastmanhouse.org/
Getty Conservation Institute: http://www.getty.edu/conservation/
Graphics Atlas - Image Permanence Institute: http://www.graphicsatlas.org/
Luminous Lint: http://www.luminous-lint.com/app/home/
Museu de História da Medicina Maximiano Lemos: http://museumaximianolemos.med.up.pt/index.php
National Media Museum: http://www.nationalmediamuseum.org.uk/
Palácio Nacional da Ajuda: http://www.pnajuda.imc-ip.pt/
Repositório da Universidade do Porto: http://repositorio.up.pt/
Talbot's Correspondence: http://foxtalbot.dmu.ac.uk/index.html