Books, Brochures, and Chapters>Book:  Stapledon, Olaf (1937), Star Maker, Retrieved on 2017-03-10

Books, Brochures, and Chapters>Book:  Abbott, Edwin A. (1884), Flatland: A Romance of Many Dimensions, Retrieved on 2015-05-31

Electronic/World Wide Web>Internet Article:  Sandberg, Anders (Unknown), We, Borg, Retrieved on 2014-11-07

Source Material [www.aleph.se]

Books, Brochures, and Chapters>Book:  Niven , Larry (1985-09-11), Ringworld, Simon and Schuster, Retrieved on 2014-10-05

Source Material [books.google.com]

Unpublished Work>Publication of Limited Circulation:  Sagan , Carl (1982), Alien united nations, Retrieved on 2014-03-03

Source Material [www.loc.gov]

Unpublished Work>Publication of Limited Circulation:  Sagan , Carl (June 21, 1973), Interstellar music : note, Retrieved on 2014-03-03

Source Material [www.loc.gov]

Books, Brochures, and Chapters>Book:  Robinson, Kim Stanley (2012-05-22), 2312, Orbit, Retrieved on 2013-05-25

Source Material [books.google.com]

Electronic/World Wide Web>Internet Article:  Dyson , Freeman (11/1997), Warm-blooded plants and freeze-dried fish: the future of space exploration. Played, The Atlantic, Retrieved on 2013-05-13

Source Material [www.theatlantic.com]

Periodicals>Journal Article:  Dyson , Freeman (June 18, 1960), Search for Artificial Stellar Sources of Infrared Radiation, Science, Vol. 131, June 3, 1960, pp. 1667-1668., Retrieved on 2013-05-13

Source Material [www.islandone.org]

Periodicals>Magazine Article:  Brower, Kenneth and Brower, David (10/01/1978), Miracle Earth, Omni Magazine, October 1978, Retrieved on 2012-12-25

Source Material [archive.org]