1. See Dusan C. Stulik and Art Kaplan, The Atlas of Analytical Signatures of Photographic Processes. (Los Angeles: Getty Conservation Institute, 2013).
  2. Stanley B. Burns, Forgotten Marriage: The Painted Tintype & the Decorative Frame, 1860-1910: A Lost Chapter in American Portraiture (New York: Burns Press, 1995).
  3. “Letters To Our Leader,” Christian Science Sentinel, June 8, 1907.