Excerpt from this book: The Sixth Extinction* Richard A. Muller, 1988, "Nemesis", Weidenfeld & Nicolson, ISBN 1-55584-173-2* Nemesis – Raup and Sepkoski* Ward, P.D., (2000) "Rivers In Time: The Search for Clues to Earth's Mass Extinctions"* Ward, P.D., (2007) "Under a Green Sky: Global Warming, the Mass Extinctions of the Past, and What They Can Tell Us About Our Future" (2007) ISBN 978-0-06-113792-1* Wilson, E.O., 2002, "The Future of Life", Vintage (pb), ISBN 0-679-76811-4==External links==* Calculate the effects of an Impact* The Current Mass Extinction Event* Species Alliance (nonprofit organization producing a documentary about Mass Extinction titled "Call of Life: Facing the Mass Extinction)* American Museum of Natural History official statement on the current mass extinction* Interstellar Dust Cloud-induced Extinction Theory* Extinction Level Event in short* Nasa's Near Earth Object Program* Fossils Suggest Chaotic Recovery from Mass Extinction – LiveScience.com* Sepkoski's Global Genus Database of Marine Animals – Calculate extinction rates for yourself!
"The Sixth Extinction : Patterns of Life and the Future of Humankind", Anchor, ISBN 0-385-46809-1.