Caldwell, Michael W.; Jr, Gorden L. Bell (1995-09-14). “Halisaurus sp. (Mosasauridae) from the Upper Cretaceous (?Santonian) of east-central Peru, and the taxonomic utility of mosasaur cervical vertebrae”. Journal of Vertebrate Paleontology15 (3): 532–544. doi:10.1080/02724634.1995.10011246. ISSN0272-4634.
Takuya Konishi, Michael W. Caldwell, Tomohiro Nishimura, Kazuhiko Sakurai & Kyo Tanoue (2015) A new halisaurine mosasaur (Squamata: Halisaurinae) from Japan: the first record in the western Pacific realm and the first documented insights into binocular vision in mosasaurs. Journal of Systematic Palaeontology (advance online publication) DOI:10.1080/14772019.2015.1113447 http://www.tandfonline.com/doi/full/10.1080/14772019.2015.1113447#abstract
Caldwell, Michael W.; Jr, Gorden L. Bell (1995-09-14). “Halisaurus sp. (Mosasauridae) from the Upper Cretaceous (?Santonian) of east-central Peru, and the taxonomic utility of mosasaur cervical vertebrae”. Journal of Vertebrate Paleontology15 (3): 532–544. doi:10.1080/02724634.1995.10011246. ISSN0272-4634.