Jefferies, R.P.S. (1979). "The Origin of Chordates — A Methodological Essay". House, M. R. (Ed.). The Origin of Major Invertebrate Groups. Londra ; New York: Academic Press for The Systematics Association. ss. 443-447. ISBN0123574501.
Czaplewski, Terry A.; Vaughan, James M.; Ryan, Nicholas J. (2000). Mammalogy (4 bas.). Fort Worth: Brooks/Cole Thomson Learning. s. 61. ISBN003025034X. 17 Nisan 2021 tarihinde kaynağından arşivlendi. Erişim tarihi: 27 Temmuz 2013.
Willmann, Rainer (2003). "From Haeckel to Hennig: the early development of phylogenetics in German-speaking Europe". Cladistics. 19 (6). ss. 449-479. doi:10.1016/j.cladistics.2003.09.001.
Marjanović, David; Laurin, Michel (1 Mart 2013). "The origin(s) of extant amphibians: a review with emphasis on the "lepospondyl hypothesis"". Geodiversitas. 35 (1). ss. 207-272. doi:10.5252/g2013n1a8.
Brysse, K. (2008). "From weird wonders to stem lineages: the second reclassification of the Burgess Shale fauna". Studies in History and Philosophy of Science Part C: Biological and Biomedical Sciences. 39 (3). ss. 298-313. doi:10.1016/j.shpsc.2008.06.004. PMID18761282.
Brysse, K. (2008). "From weird wonders to stem lineages: the second reclassification of the Burgess Shale fauna". Studies in History and Philosophy of Science Part C: Biological and Biomedical Sciences. 39 (3). ss. 298-313. doi:10.1016/j.shpsc.2008.06.004. PMID18761282.
Czaplewski, Terry A.; Vaughan, James M.; Ryan, Nicholas J. (2000). Mammalogy (4 bas.). Fort Worth: Brooks/Cole Thomson Learning. s. 61. ISBN003025034X. 17 Nisan 2021 tarihinde kaynağından arşivlendi. Erişim tarihi: 27 Temmuz 2013.