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Waite, J. H.; Cravens, T. E.; Coates, A. J.; Crary, F. J.; Magee, B.; Westlake, J. (2007). "The Process of Tholin Formation in Titan's Upper Atmosphere". Science. 316 (5826). ss. 870-5. Bibcode:2007Sci...316..870W. doi:10.1126/science.1139727. PMID17495166.
Huygens, Christiaan; Société hollandaise des sciences (1888). Oeuvres complètes de Christiaan Huygens (Latince). 1. The Hague, Netherlands: Martinus Nijhoff. ss. 387-388. 31 Ocak 2019 tarihinde kaynağından arşivlendi. Erişim tarihi: 31 Ocak 2019.