Olivero E. B. (2012). Sedimentary cycles, ammonite diversity and palaeoenvironmental changes in the Upper Cretaceous Marambio Group, Antarctica. Cretaceous Research. 34: 348—366. doi:10.1016/j.cretres.2011.11.015.
Carpenter K., Dilkes D., Weishampel D. B. (1995). The dinosaurs of the Niobrara Chalk Formation (upper Cretaceous, Kansas). Journal of Vertebrate Paleontology15(2): 275—297. doi:10.1080/02724634.1995.10011230.
Lee Y.-N. (1996). A new nodosaurid ankylosaur (Dinosauria: Ornithischia) from the Paw Paw Formation (Late Albian) of Texas. Journal of Vertebrate Paleontology16(2): 232—245. doi:10.1080/02724634.1996.10011311.