Ralph D. Lorenz, Jonathan I. Lunine, Christopher P. McKay. «Titan under a red giant sun: A new kind of "habitable" moon» (PDF). NASA Ames Research Center, Lunar and Planetary Laboratory, Department of Planetary Sciences, University of Arizona, 1997. Arxivat de l'original el 2011-07-24. [Consulta: 10 maig 2013].(anglès)
Raulin, F. «Exo-astrobiological aspects of Europa and Titan: From observations to speculations». Space Science Review, 116, 1–2, 2005, pàg. 471–487. Bibcode: 2005SSRv..116..471R. DOI: 10.1007/s11214-005-1967-x.(anglès)
Raulin, F. «Exo-astrobiological aspects of Europa and Titan: From observations to speculations». Space Science Review, 116, 1–2, 2005, pàg. 471–487. Bibcode: 2005SSRv..116..471R. DOI: 10.1007/s11214-005-1967-x.(anglès)
Committee on the Limits of Organic Life in Planetary Systems, Committee on the Origins and Evolution of Life, National Research Council; The Limits of Organic Life in Planetary Systems; The National Academies Press, 2007; page 74.
Committee on the Limits of Organic Life in Planetary Systems, Committee on the Origins and Evolution of Life, National Research Council; [1]; The National Academies Press, 2007; pàgines 74-75(anglès)
«The Pioneer Missions». Pioneer Project, 26-03-2007. Arxivat de l'original el 2011-08-15. [Consulta: 10 maig 2013].(anglès)
Ralph D. Lorenz, Jonathan I. Lunine, Christopher P. McKay. «Titan under a red giant sun: A new kind of "habitable" moon» (PDF). NASA Ames Research Center, Lunar and Planetary Laboratory, Department of Planetary Sciences, University of Arizona, 1997. Arxivat de l'original el 2011-07-24. [Consulta: 10 maig 2013].(anglès)
Pohorille, Andrew. «Comment on Titan First», 13-05-2009. Arxivat de l'original el 2011-07-21. [Consulta: 10 maig 2013].(anglès)