E. M. Knutsen, P. S. Druckenmiller, and J. Hurum. 2012. Redescription and taxonomic clarification of ‘Tricleidus’ svalbardensis based on new material from the Agardhfjellet Formation (Middle Volgian). Norwegian Journal of Geology 92:175-186
M. J. Benton and P. S. Spencer. 1995. Fossil Reptiles of Great Britain. Chapman & Hall, London
DOI ↗
J. B. Delair. 1993. Reptilia from the Portland Stone (Upper Jurassic) of England: a preliminary survey of the material and the literature. Modern Geology 18:331-348
D. S. Brown. 1984. Discovery of a specimen of the plesiosaur Colymbosaurus trochanterius (Owen) on the Island of Portland. Proceedings of the Dorset Natural History and Archaeological Society 105:170
D. S. Brown. 1981. The English Upper Jurassic Plesiosauroidea (Reptilia) and a review of the phylogeny and classification of the Plesiosauria. Bulletin of the British Museum (Natural History) 35(4):253-347
R. L. Paton. 1975. A Catalogue of Fossil Vertebrates in the Royal Scottish Museum, Edinburgh. Part Four / Amphibia & Reptilia. Royal Scottish Museum Information Series. Geology 5
P. O. Persson. 1963. A revision of the classification of the Plesiosauria, with a synopsis of the stratigraphical and geographical distribution of the group. Lunds Universitets Arsskrift N. F. Serie 2 59(1):1-57
J. B. Delair. 1960. The Mesozoic reptiles of Dorset. Part two. Proceedings of the Dorset Natural History and Archaeological Society 80:52-90
H.-E. Sauvage. 1888. Sur les Reptiles trouvés dans le Portlandien supérieur de Boulogne-sur-Mer [On the reptiles found in the upper Portlandian of Boulogne-sur-Mer]. Bulletin de la Société Géologique de France, 3e série 16:623-632
J. Phillips. 1871. Geology of Oxford and the Valley of the Thames. Clarendon Press, Oxford
DOI ↗
J. W. Hulke. 1870. Note on some plesiosaurian remains obtained by JC Mansel, Esq, FGS, in Kimmeridge Bay, Dorset. Quarterly Journal of the Geological Society 26:611-622
DOI ↗
R. Owen. 1869. Monographs on the British Fossil Reptilia from the Kimmeridge Clay III: contains Pliosaurus grandis, Pliosaurus trochanterius, and Pliosaurus portlandicus. Palaeontographical Society Monographs 22(98):1-12
H. G. Seeley. 1869. Index to the Fossil Remains of Aves, Ornithosauria, and Reptilia, from the Secondary System of Strata, Arranged in the Woodwardian Museum of the University of Cambridge. Deighton, Bell, and Co, Cambridge
DOI ↗
R. Owen. 1840. Report on British fossil reptiles. Report of the British Association for the Advancement of Science 8:43-126