Gruber, Howard E. and Gruber, Valmai. 1962. “The Eye of Reason: Darwin’s Development During the Beagle Voyage.”Isis 53: 186–200. Reprinted in Gruber and Bödeker (2005, 109–122).
Further References
Gruber, Howard E. and Bödeker, Katja, eds. 2005. Creativity, Psychology and the History of Science. Boston Studies in the Philosophy of Science n. 245. Dordrecht: Springer.