Electronic/World Wide Web>Internet Article:  Tyson, Niel DeGrasse (April 2, 2007), The Cosmic Perspective, Retrieved on 2015-03-02

Source Material [www.haydenplanetarium.org]

Electronic/World Wide Web>Internet Article:  Siegel, Ethan (4/26/2014), Ask Ethan #34: Using up the Universe’s fuel, Retrieved on 2014-08-09

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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

Periodicals>Journal Article:  Sagan , Carl and Walker, Russell G. (August 27, 1965), The Infrared Detectability of Dyson Civilizations, American Astronomical Society, Retrieved on 2014-03-16

Source Material [articles.adsabs.harvard.edu]

Unpublished Work>Publication of Limited Circulation:  Sagan , Carl (21 December, 1981), Stages of galactic history with respect to extraterrestrial intelligence : note, Retrieved on 2014-03-03

Source Material [www.loc.gov]

Electronic/World Wide Web>Blog:  Tyson, Niel DeGrasse , Twitter Account, Twitter, Retrieved on 2013-08-21

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Periodicals>Journal Article:  R. P., A., Jr., P. L., S. A. (1981), A million cubic megaparsec void in Bootes, Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 1, 1981, p. L57-L60., Retrieved on 2012-07-06

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Books, Brochures, and Chapters>Book Chapter:  Gold, Thomas (1975), Cosmology, Vistas in astronomy, Retrieved on 2012-05-30

Source Material [books.google.com]

Electronic/World Wide Web>Internet Article:  NASA, (March 9, 2004), Hubble's Deepest View Ever of the Universe Unveils Earliest Galaxies, NASA, Retrieved on 2012-01-06

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Books, Brochures, and Chapters>Book:  Herschel , John Frederick William (1831), A Preliminary Discourse on the Study of Natural Philosophy, Retrieved on 2012-01-02

Source Material [books.google.com]