Harper, D. A. T., University of Copenhagen

• Digital Treatise Part H, Brachiopoda (Revised), vol. 2 & 3 (2000) - Chapters
  Part H, Brachiopoda (Revised), vol. 2 & 3, ch. 6, p. 619–689
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 2 & 3 (2000) - Chapters
  Part H, Brachiopoda (Revised), vol. 2 & 3, ch. 7, p. 689–782
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 2 & 3 (2000) - Chapters
  Part H, Brachiopoda (Revised), vol. 2 & 3, ch. 8, p. 782–846
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 6 (2007) - Chapters
  Part H, Brachiopoda (Revised), vol. 6, ch. 5, p. 2639–2683
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• 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. 6 (2007) - Chapters
  Part H, Brachiopoda (Revised), vol. 6, Complete Volume
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