(en) T. R. Smithson, S. P. Wood, J. E. A. Marshall et J. A. Clack, « Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap », Proceedings of the National Academy of Sciences, vol. 109, no 12, , p. 4532–4537 (ISSN0027-8424, PMID22393016, PMCID3311392, DOI10.1073/pnas.1117332109)
(en) T. R. Smithson, S. P. Wood, J. E. A. Marshall et J. A. Clack, « Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap », Proceedings of the National Academy of Sciences, vol. 109, no 12, , p. 4532–4537 (ISSN0027-8424, PMID22393016, PMCID3311392, DOI10.1073/pnas.1117332109)
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(en) T. R. Smithson, S. P. Wood, J. E. A. Marshall et J. A. Clack, « Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap », Proceedings of the National Academy of Sciences, vol. 109, no 12, , p. 4532–4537 (ISSN0027-8424, PMID22393016, PMCID3311392, DOI10.1073/pnas.1117332109)