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Nord, David; Joan Shelley Rubin (2009). "Science Books Since 1945". A History of the Book in America: Volume 5: The Enduring Book: Print Culture. Michael Schudson. UNC Press. p. 357. ISBN978-0-8078-3285-1.
Lessel, Thomas (May 1985). "Science and the Sacred Cosmos: The Ideological Rhetoric of Carl Sagan". Quarterly Journal of Speech. 71 (2): 175–187. doi:10.1080/00335638509383727.
Lawler, Peter (Summer 1999). "Aliens, the Cosmos, and the Foundations of Political Life". Perspectives on Political Science. 28 (3): 131. doi:10.1080/10457099909602354.
goodreads.com
"Cosmos". Goodreads. 2002-05-07. Retrieved 3 January 2010.