Alfred John Frost, Robert Rougelot Prechter (Jr.), Robert Rougelot Prechter (1998). “Elliott Wave Principle: Key to Market Behavior”, p.137, Elliott Wave International
P. J. O'Rourke (2007). “All the Trouble in the World: The Lighter Side of Overpopulation, Famine, Ecological Disaster, Ethnic Hatred, Plague, and Poverty”, p.327, Grove/Atlantic, Inc.