T. Townsend, A. Larson, E. Louis, J.R. Macey: Molecular phylogenetics of squamata: the position of snakes, amphisbaenians, and dibamids, and the root of the squamate tree. Syst Biol. 2004 Oct;53(5):735-57. Abstract
Nicolas Vidal, S. Blair Hedges: The phylogeny of squamate reptiles (lizards, snakes, and amphisbaenians) inferred from nine nuclear protein-coding genes. C. R. Biologies 328 (2005) 1000–1008 Fulltext PDFArkiverad 30 juli 2009 hämtat från the Wayback Machine.
Nicolas Vidal, S. Blair Hedges: Lizards, snakes and amphisbaenias (Squamata)PDF in S. Blair Hedges und Sudhir Kumar: The Timetree of Life. Oxford University Press, ISBN 0-19-953503-5
Nicolas Vidal, S. Blair Hedges: The phylogeny of squamate reptiles (lizards, snakes, and amphisbaenians) inferred from nine nuclear protein-coding genes. C. R. Biologies 328 (2005) 1000–1008 Fulltext PDFArkiverad 30 juli 2009 hämtat från the Wayback Machine.