M.J. Polcyn, and G.L. Bell Jr. “Russellosaurus Coheni N. gen., N. Sp., a 92 Million-Year-Old Mosasaur from Texas (USA), and the Definition of the Parafamily Russellosaurina”. Netherlands Journal of Geosciences, vol. 84, Sept. 2005, pp. 321 -33, doi:10.1017/S0016774600021107.