{{sfn|Smith|Siegel|2000|p=}}
* {{cite book | last=Smith | first=Robert Baer | last2=Siegel | first2=Lee J. | title=Windows into the earth: the geologic story of Yellowstone and Grand Teton National Parks | publisher=Oxford University Press | publication-place=Oxford ; New York | date=2000 | isbn=0-19-510596-6}}
<ref name="x752">{{cite book | last=Smith | first=Robert Baer | last2=Siegel | first2=Lee J. | title=Windows into the earth: the geologic story of Yellowstone and Grand Teton National Parks | publisher=Oxford University Press | publication-place=Oxford ; New York | date=2000 | isbn=0-19-510596-6 | page=}}</ref>