Yeomans, Donald K. "Comet[halott link] World Book Online Reference Center. 2005. Also available from World book @ NASA hereArchiválva2010. január 11-i dátummal a Wayback Machine-ben.
Jan D. Kramers, Marco A.G. Andreoli, Maria Atanasova, Georgy A. Belyanin, David L. Block, Chris Franklyn, Chris Harris, Mpho Lekgoathi, Charles S. Montross, Tshepo Ntsoane, Vittoria Pischedda, Patience Segonyane, K.S. (Fanus) Viljoen, Johan E. Westraadt. Unique chemistry of a diamond-bearing pebble from the Libyan Desert Glass strewnfield, SW Egypt: Evidence for a shocked comet fragment. Earth and Planetary Science Letters, 2013; 382: 21 DOI: 10.1016/j.epsl.2013.09.003 - Idézi: http://www.sciencedaily.com/releases/2013/10/131008091543.htm First Ever Evidence of a Comet Striking Earth, 2013-10-08
Yeomans, Donald K. "Comet[halott link] World Book Online Reference Center. 2005. Also available from World book @ NASA hereArchiválva2010. január 11-i dátummal a Wayback Machine-ben.
Yeomans, Donald K. "Comet[halott link] World Book Online Reference Center. 2005. Also available from World book @ NASA hereArchiválva2010. január 11-i dátummal a Wayback Machine-ben.