1. Bok, Sissela. 1983.Secrets: On the Ethics of Concealment and Revelation, 5–14. New York: Random House, Vintage Books.
2. Invention, Authorship, "Intellectual Property," and the Origin of Patents: Notes toward a Conceptual History
3. Dobbs, Betty Jo Teeter. 1975.The Foundations of Newton's Alchemy or “The Hunting of the Greene Lyon”., 25–47. Cambridge: Cambridge University Press. for a discussion of some reasons for alchemical secrecy, and further bibliography
4. Secret Communication among the Greeks and Romans