(en) T.R. Smithson, Wood, S.P., Marshall, J.E.A. et Clack, J.A., « Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap », Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no 12, , p. 4532–4537 (PMID22393016, PMCID3311392, DOI10.1073/pnas.1117332109, Bibcode2012PNAS..109.4532S)
(en) T.R. Smithson, Wood, S.P., Marshall, J.E.A. et Clack, J.A., « Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap », Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no 12, , p. 4532–4537 (PMID22393016, PMCID3311392, DOI10.1073/pnas.1117332109, Bibcode2012PNAS..109.4532S)
(en) T.R. Smithson, Wood, S.P., Marshall, J.E.A. et Clack, J.A., « Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap », Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no 12, , p. 4532–4537 (PMID22393016, PMCID3311392, DOI10.1073/pnas.1117332109, Bibcode2012PNAS..109.4532S)