Pritchard, Michael; Nicholson, Angela (2005). "Camera development". The Oxford Companion to the Photograph. Oxford University Press. ISBN978-0-19-866271-6. Archived from the original on 10 November 2023. Retrieved 2019-12-12.
Pritchard, Michael; Nicholson, Angela (2005). "Camera development". The Oxford Companion to the Photograph. Oxford University Press. ISBN978-0-19-866271-6. Archived from the original on 10 November 2023. Retrieved 2019-12-12.