Nikola Tesla (2002). “Nikola Tesla on His Work with Alternating Currents and Their Application to Wireless Telegraphy, Telephony, and Transmission of Power: An Extended Interview”, p.110, 21st Century Books
"The New Inquisitions: Heretic-Hunting and the Intellectual Origins of Modern Totalitarianism" by Arthur Versluis, Oxford University Press, (p. 39), 2006.