^Williston, S. W. 1890a. Structure of the plesiosaurian skull. Science 16(407):290.
^Williston, S. W. 1890b. A new plesiosaur from the Niobrara Cretaceous of Kansas. Kansas Academy Science, Transactions 7:174-178, with 2 fig.
^Williston, S. W. 1906. "North American Plesiosaurs:Elasmosaurus,Cimoliasaurus, andPolycotylus".American Journal of Science 4(21):221-236.
^Welles, S. P. 1943. Elasmosaurid plesiosaurs with a description of the new material from California and Colorado. University of California Memoirs 13:125-254. figs.1-37., pls.12-29.
^6.06.1Carpenter, K. 1999. Revision of North American elasmosaurs from the Cretaceous of the western interior. Paludicola 2(2):148-173.
^Everhart, M. J. 2005a. Oceans of Kansas - A Natural History of the Western Interior Sea. Indiana University Press, 320 pp.
^Cicimurri, D. J. and M. J. Everhart, 2001. An elasmosaur with stomach contents and gastroliths from the Pierre Shale (late Cretaceous) of Kansas. Kansas Acad. Sci. Trans 104(3-4):129-143.
^Everhart, M. J. 2000. Gastroliths associated with plesiosaur remains in the Sharon Springs Member of the Pierre Shale (Late Cretaceous), western Kansas. Kansas Academy of Science, Transactions 103(1-2): 58-69.
^Wings, Oliver (2004): Identification, distribution, and function of gastroliths in dinosaurs and extant birds with emphasis on ostriches (Struthio camelus). Ph.D. Thesis, The University of Bonn, Bonn, Germany, 187 pp. URN:urn:nbn:de:hbz:5N-04626PDF fulltextArchive.today的存檔，存档日期2007-07-16
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