Gradmann, Christoph Department Experimental Systems and Spaces of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
Gradmann, C. (1997). Koch, Heinrich Hermann Robert. In W. Killy (Ed.), Deutsche biographische Enzyklopädie. Bd. 5 (pp. 643). München [u.a.]: Saur [u.a.].