List of references by intial letter. Not all the references are complete or correct. If you have more or better information, please let me know.

Zangerl, R. ; 1963; Preliminary results of the Restudy of Corosaurus alcovensis CASE, the only know New World Nothosaur; Contributions to Geology; 2:2: pp.117-124:
Zangerl, R. and Peyer, B. ; 1935; Die Triasfauna der Tessiner Kalkalpen IX. Pachypleurosaurus edwardsi, CORNALIA sp. Osteologie-Variationsbeite-Biologie,; Abhandlungen der Schweierischen Palaeontologischen Gesellschaft; Band LVI: pp.1-80:
Zanon, Robert T. ; 1986; A graphical method for examining shape variation in plesiosaur vertebral centra; Fourth North American Paleontological Convention. Abstracts with Programs; pp.A52:
Zanon, Robert T. ; 1987; On the phylogentic position of sauropterygia within diapsida; American Zoologist; 27:4: pp.309:
Zarnik, B. ; 1925; (Translation of Zarnik 1925) On the ethology of plesiosaurs with contributions to the mechanism of the cervical vertebrae of recent saurosids; ;
Zarnik, B. ; 1925a; K ethologiji plesiosaurija, sa prinosima mehanici kraljeznice u recentnih sauropsida; ;
Zarnik, B. ; 1925b; Sketologiji plesiosauriija, sa prinosima mehanici kraljeznice u recentnih sauropsida.; Societas Scientiarum Naturalium Croatica, Hrvatskoga Naravoslovno Drestva; 38-39: pp.424-473:
Zawisha, P. H. ; 1987; Ein Fund von Saurierwirbeln aus der Unterkreide; Arbeitskreis Palaeontologie Hannover; 15:4: pp.85:
Zawisha, P. H. and Lee, I. ; 1995; The preparation, design, fabrication, engineering and installation of a mount for Thalassomedon haningtoni (long-necked plesiosaur); Journal of Vertebrate Paleontology; 15:3, Suppl.: pp.61:
Zenker ; 1833; ?; ?;
Zhang, Yihong ; 1985a; ; Vertebrata PalAsiatica Gujizhui Dongwu Xuebao; 23:3: pp.235--240:
Zhang, Yihong ; 1985b; A new Plesiosaur from Middle Jurassic of Sichuan Basin; Vertebrata PalAsiatica; 23:3: pp.235-240:
Zhao, Y.-L. ; 1986a; Sinopliosaurus jingguensis, Plesiosaurus changduensis, Peloneustes kiangschenensis; ?;
Zhongjian, Yang ; 1982; , edited by Zhou Mingzhen; Academia Sinica, Beijingpp 155-158
Zhou, Zhonghe ; 1986b; The Cretaceous System of China.; Stratigraphy of China; 12: pp.66-78:
Zhuravlev, K I ; 1941; ; ;
Ziegler, Bernhard ; 1994; Nothosaurus edingerae Schultze, 1970; diagnosis of the species and comments on its stratigraphical occurrence; Stuttgarter Beitraege zur Naturkunde. Serie B: Geologie und Palaeontologie; 204:
Zinzmeister, W. J. ; 1982; First U.S. expedition to the James Ross Island area, Antarctic Peninsula; Antarctic Journal of the United States; 17:5: pp.63--64:
Zittel ; 1890; ?; ?;