Narkiewicz, Katarzyna; Narkiewicz, Marek. «The age of the oldest tetrapod tracks from Zachełmie, Poland». Lethaia. 48 (1): 10–12. ISSN0024-1164. doi:10.1111/let.12083
Coates, Michael I.; Ruta, Marcello; Friedman, Matt (2008). «Ever Since Owen: Changing Perspectives on the Early Evolution of Tetrapods». Annual Review of Ecology, Evolution, and Systematics. 39 (1): 571–592. ISSN1543-592X. JSTOR30245177. doi:10.1146/annurev.ecolsys.38.091206.095546
Frobisch, N. B.; Schoch, R. R. (2009). «Testing the Impact of Miniaturization on Phylogeny: Paleozoic Dissorophoid Amphibians». Systematic Biology. 58 (3): 312–327. ISSN1063-5157. PMID20525586. doi:10.1093/sysbio/syp029
Coates, Michael I.; Ruta, Marcello; Friedman, Matt (2008). «Ever Since Owen: Changing Perspectives on the Early Evolution of Tetrapods». Annual Review of Ecology, Evolution, and Systematics. 39 (1): 571–592. ISSN1543-592X. JSTOR30245177. doi:10.1146/annurev.ecolsys.38.091206.095546
Frobisch, N. B.; Schoch, R. R. (2009). «Testing the Impact of Miniaturization on Phylogeny: Paleozoic Dissorophoid Amphibians». Systematic Biology. 58 (3): 312–327. ISSN1063-5157. PMID20525586. doi:10.1093/sysbio/syp029
Narkiewicz, Katarzyna; Narkiewicz, Marek. «The age of the oldest tetrapod tracks from Zachełmie, Poland». Lethaia. 48 (1): 10–12. ISSN0024-1164. doi:10.1111/let.12083
Coates, Michael I.; Ruta, Marcello; Friedman, Matt (2008). «Ever Since Owen: Changing Perspectives on the Early Evolution of Tetrapods». Annual Review of Ecology, Evolution, and Systematics. 39 (1): 571–592. ISSN1543-592X. JSTOR30245177. doi:10.1146/annurev.ecolsys.38.091206.095546
Frobisch, N. B.; Schoch, R. R. (2009). «Testing the Impact of Miniaturization on Phylogeny: Paleozoic Dissorophoid Amphibians». Systematic Biology. 58 (3): 312–327. ISSN1063-5157. PMID20525586. doi:10.1093/sysbio/syp029