Guensburg, T.E.; Sprinkle, J. (2003). The oldest known crinoids (Early Ordovician, Utah) and a new crinoid plate homology system. Bulletins of American Paleontology, 364, 1-43
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Guensburg, T.E.; Sprinkle, J.
2003
The oldest known crinoids (Early Ordovician, Utah) and a new crinoid plate homology system.