Cortes Pereira, Catarina Luísa, Carolina Barata, Rita Gaspar, y Laura Castro. «El Retouching Scientific Photography – The Glass Plate Negatives Collection at the Natural History and Science Museum – University of Porto». Ge-conservacion 12 (diciembre 16, 2017): 101-110. Accedido agosto 15, 2022. https://www.ge-iic.com/ojs/index.php/revista/article/view/540.