Ketchum, H. F., and Benson, R. B. J., 2010. "Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses". Biological Reviews, v. 85, p. 361-392 doi:10.1111/j.1469-185X.2009.00107.xPMID 20002391
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Ketchum, H. F., and Benson, R. B. J., 2010. "Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses". Biological Reviews, v. 85, p. 361-392 doi:10.1111/j.1469-185X.2009.00107.xPMID 20002391