Speak, Gill (1990). "An odd kind of melancholy: reflections on the glass delusion in Europe (1440–1680)". History of Psychiatry. 1 (2): 191–206. doi:10.1177/0957154X9000100203. S2CID163047294.
Speak, Gill (1990). "An odd kind of melancholy: reflections on the glass delusion in Europe (1440–1680)". History of Psychiatry. 1 (2): 191–206. doi:10.1177/0957154X9000100203. S2CID163047294.