Modesto, Sean P. i Anderson, Jason S. (2004) The Phylogenetic Definition of Reptilia, „Systematic Biology” 53 (5): 815–821. DOI: 10.1080/10635150490503026
Hill, Robert V. (2005) Integration of Morphological Data Sets for Phylogenetic Analysis of Amniota: The Importance of Integumentary Characters and Increased Taxonomic Sampling, „Systematic Biology” 54(4):530–547. DOI: 10.1080/10635150590950326