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 fulltextArchived 2007-07-16 at archive.today
Smith, E.A.; O'Keefe, F.R. (2023). "Occurrence of Styxosaurus (Sauropterygia: Plesiosauria) in the Cenomanian: Implications for relationships of elasmosaurids of the Western Interior Seaway". Journal of Systematic Palaeontology. 21 (1): 2242846. Bibcode:2023JSPal..2142846A. doi:10.1080/14772019.2023.2242846.
Otero RA. (2016) Taxonomic reassessment of Hydralmosaurus as Styxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous. PeerJ 4:e1777 https://doi.org/10.7717/peerj.1777
Smith, E.A.; O'Keefe, F.R. (2023). "Occurrence of Styxosaurus (Sauropterygia: Plesiosauria) in the Cenomanian: Implications for relationships of elasmosaurids of the Western Interior Seaway". Journal of Systematic Palaeontology. 21 (1): 2242846. Bibcode:2023JSPal..2142846A. doi:10.1080/14772019.2023.2242846.
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 fulltextArchived 2007-07-16 at archive.today