Harper, C. W.; Johnson, J. G.; Boucot, A. J. (1967). The Pholidostrophiinae (Brachiopoda; Ordovician, Silurian, Devonian). Senckenbergiana Lethaea. 48: 403-461.
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Harper, C. W.; Johnson, J. G.; Boucot, A. J.
1967
The Pholidostrophiinae (Brachiopoda; Ordovician, Silurian, Devonian)