Vallin, Grégoire; Laurin, Michel. Cranial morphology and affinities of Microbrachis, and a reappraisal of the phylogeny and lifestyle of the first amphibians. Journal of Vertebrate Paleontology. 2004, 24 (1): 56–72. doi:10.1671/5.1.
Ruta, M.; Coates, M.I. Dates, nodes and character conflict: addressing the lissamphibian origin problem. Journal of Systematic Palaeontology. 2007, 5 (1): 69–122. doi:10.1017/S1477201906002008.
Lombard, R. Eric; Bolt, John R. Evolution of the tetrapod ear: An analysis and reinterpretation. Biological Journal of the Linnean Society. 1979, 11: 19–76. doi:10.1111/j.1095-8312.1979.tb00027.x.
Smithson, T. R.; Paton, R. L.; Clack, J. A. An amniote-like skeleton from the Early Carboniferous of Scotland. Nature. 1999, 398 (672 7): 508–13. Bibcode:1999Natur.398..508P. doi:10.1038/19071.
Smithson, T. R.; Paton, R. L.; Clack, J. A. An amniote-like skeleton from the Early Carboniferous of Scotland. Nature. 1999, 398 (672 7): 508–13. Bibcode:1999Natur.398..508P. doi:10.1038/19071.