Project 4770: B. KRÖGER, R. MAPES. 2007. Carboniferous Actinoceratoid Nautiloidea (Cephalopoda) - A New Perspective. Journal of Paleontology. 81 (4):714-724.
KRÖGER, B. and MAPES, R. 2007. Carboniferous Actinoceratoid Nautiloidea (Cephalopoda) - A New Perspective. Journal of Paleontology. Vol. 81(4), pp. 714-724.