Lund, R. (1990)
Chondrichthyan life history styles as revealed by the 320 million years old Mississippian of Montana.
Environmental Biology of Fishes, 27(1), 1–19 DOI: 10.1007/BF00004900
Cicimurri, D.J. & Fahrenbach, M.D. (2002)
Chondrichthyes from the upper part of the Minnelusa Formation (Middle Pennsylvanian: Desmoinesian), Meade County, South Dakota.
Proceedings of the South Dakota Academy of Science, 81, 81–92