Hoffmann, Christoph Department Experimental Systems and Spaces of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
Hoffmann, C. (2009). Helmholtz, Hermann von: Handbuch der physiologischen Optik. In H. L. Arnold (Ed.), Kindlers Literatur Lexikon. Vol. 7 (3., völlig neu bearb. Aufl., pp. 330-331). Stuttgart: Metzler.