Periodicals>Journal Article:  Wissner-Gross, A. D. and Freer, C. E. (19 April 2013), Causal Entropic Forces, Physical Review Letters, Retrieved on 2013-04-23

Source Material [www.alexwg.org]

Electronic/World Wide Web>Internet Article:  Gorski, Chris (Apr 19 2013), Physicist Proposes New Way To Think About Intelligence, Inside Science, Retrieved on 2013-04-23

Source Material [www.insidescience.org]

Electronic/World Wide Web>Internet Article:  Reynolds, Gretchen (September 28, 2011), How Exercise Can Strengthen the Brain, New York Times, New York, Retrieved on 2011-09-30

Source Material [well.blogs.nytimes.com]

Electronic/World Wide Web>Internet Article:  Lehrer, Jonah (JUNE 11, 2011), Boot Camp for Boosting IQ, Wall Street Journal, New York, Retrieved on 2011-06-13

Source Material [online.wsj.com]

Books, Brochures, and Chapters>Book:  Genta , Giancarlo (2007-06-15), Lonely Minds in the Universe: The Search for Extraterrestrial Intelligence, Springer, Retrieved on 2011-03-06