1. Extinction: How Life on Earth Nearly Ended 250 Million Years Ago;DH Erwin,2006
2. When Life Nearly Died;MJ Benton,2003
3. Insect diversity in the fossil record.;CC Labandeira;Science,1993
4. Mass extinction events and the plant fossil record.;JC McElwain;Trends in Ecology & Evolution,2007
5. Anomodontia;GM King,1988