Owen, E. F., The Natural History Museum

• Digital Treatise Part H, Brachiopoda (Revised), vol. 6 (2007) - Chapters
  Part H, Brachiopoda (Revised), vol. 6, ch. 6, p. 2684–2741
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 4 (2002) - Chapters
  Part H, Brachiopoda (Revised), vol. 4, ch. 2, p. 1027–1131
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 4 (2002) - Chapters
  Part H, Brachiopoda (Revised), vol. 4, ch. 3, p. 1132–1218
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 4 (2002) - Chapters
  Part H, Brachiopoda (Revised), vol. 4, ch. 4, p. 1218–1308
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 4 (2002) - Chapters
  Part H, Brachiopoda (Revised), vol. 4, ch. 5, p. 1308–1376
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 4 (2002) - Chapters
  Part H, Brachiopoda (Revised), vol. 4, Complete Volume
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