References
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- Griffiths, A. (1996). Prints and Printmaking: An Introduction to the History and Techniques. University of California Press.
- Hanson, D. A. (1993). Baron Frederick Wilhelm von Egloffstein: Inventor of the first commercial halftone process in America. Printing History, XV(1), 12–24.
- Ives, J. C. (1861). Report upon the Colorado River of the West. Government Printing Office.
- Rovan, S. (2012). The Baron in the Grand Canyon. Friedrich Wilhelm von Egloffstein in the West. University of Missouri Press.