Carter, J. L.; Johnson, J. G.; Gourvennec, R.; Hou, H. (1994). A revised classification of the spiriferid brachiopods. Annals of Carnegie Museum. 63: 327-374.
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Carter, J. L.; Johnson, J. G.; Gourvennec, R.; Hou, H.
1994
A revised classification of the spiriferid brachiopods