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Williams, A., 1951, Llandovery brachiopods from Wales with special reference to the Llandovery district: Geological Society of London Quarterly Journal, v. 107, p. 85-136.
---, 1953, North American and European stropheodontids - their morphology and systematics, 56 of Geological Society of America, Memoirs: p. 1-67.
Ziegler, A. M., 1966, The Silurian brachiopod Eocoelia hemisphaerica(J. de C. Sowerby) and related species: Palaeontology, v. 9, p. 523-543.
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