Occurrence, Mitigation, and Consequences. Springer. pp. 172–73. ISBN 9781402028519. Retrieved 2 August 2013. Bowman, John Stewart (2000). Columbia Chronologies...
Occurrence, Mitigation, and Consequences. Springer Netherlands. p. 193. ISBN 978-1402028519. Archived from the original on 30 July 2022. Retrieved 30 July 2022...