1. Milner, A. R. in The Phylogeny and Classification of the Tetrapods (ed. Benton, M. J.) Vol. 1, Amphibians, Reptiles, Birds 59–102 (Clarendon Press, Oxford, 1988)
2. Milner, A. R. The Paleozoic relatives of lissamphibians. Herpetol. Monogr. 7, 8–27 (1993)
3. Schoch, R. R. & Milner, A. R. in Recent Advances in the Origin and Early Radiation of Vertebrates (eds Arratia, G., Wilson, M. V. H. & Cloutier, R.) 345–377 (Verlag Dr. Fredrich Pfeil, München, 2004)
4. Bolt, J. R. in Origins of the Higher Groups of Tetrapods: Controversy and Consensus (eds Schultze, H.-P. & Trueb, L.) 194–222 (Comstock Publishing Associates, Ithaca, 1991)
5. Ruta, M. & Coates, M. I. Dates, nodes and character conflict: Addressing the lissamphibian origin problem. J. Syst. Palaeontol. 5, 69–122 (2007)