"ELECTRICITY WILL KEEP THE WORLD FROM FREEZING UP; Noted Expert, Dr. C.P. Steinmetz, Talks of the Future Wonders of Scientific Discovery and Ridicules Many Prophecies". The New York Times Interview, www.nytimes.com. November 12, 1911.
Charles Proteus Steinmetz, Joseph Le Roy Hayden (1917). “Steinmetz Electrical Engineering Library: Engineering mathematics; a series of lectures delivered at Union college (3rd ed. 1917)”