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² Martins, Zita; Botta, Oliver; Fogel, Marilyn L.; Sephton, Mark A.; Glavin, Daniel P.; Watson, Jonathan S.; Dworkin, Jason P.; Schwartz, Alan W. et al (15 June 2008). "Extraterrestrial nucleobases in the Murchison meteorite". Earth and Planetary Science Letters 270 (1-2): 130–136.

³ Lincoln, Tracey A.; Joyce, Gerald F. (January 8, 2009). "Self-Sustained Replication of an RNA Enzyme". Science 323 (5918): 1229–32.

⁴ Tim Radford. “Warning sounded on decline of species”, The Guardian, March 18, 2004, http://www.guardian.co.uk/science/2004/mar/19/taxonomy.science

⁵ http://discovermagazine.com/2008/aug/05-could-pandas-be-an-evolutionary-mistake2014or-proof-of-an-intelligent-designer#.UPGu9ehEB-Y