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2. Bayle E. (1878) — Explication de la carte géologique de la France. IV, 1ère partie. Fossiles principaux des terrains. Atlas, Paris, 22 pl.
3. Lower Gedinnian Brachiopods of Belgium;Boucot;Mém. Inst. géol. Univ. Louvain,1960
4. Early Paleozoic Brachiopods of the Moose River Synclinorium, Maine;Boucot;U.S. Geol. Surv., prof. Paper,1973