Miller, H.W., Jr., . 1957b. Intestinal casts in Pachyrhizodus, an elopid fish from the Niobrara formation of Kansas. Transactions of the Kansas Academy of Science, 60:400-402
Shimada, K., 2006. Annotated checklist of fossil fishes from the Smoky Hill Chalk of the Niobrara Chalk (Upper Cretaceous) in Kansas. , 35:193-213