Periodicals>Journal Article:  Dyson , Freeman J. (Jun. 3, 1960), Search for Artificial Stellar Sources of Infrared Radiation, Science, New Series, Vol. 131, No. 3414 (Jun. 3, 1960), pp. 1667-1668, Retrieved on 2014-03-16

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