Gordon, M. (1965). Carboniferous cephalopods of Arkansas. <em>U.S. Geological Survey Professional Paper.</em> 460: 1-303.[details]
MolluscaBase eds. (2025). MolluscaBase. Carbactinoceras protentum M. Gordon, 1965 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1756673 on 2025-05-23
Marine Species Traits editorial board (2025). Marine Species Traits. Carbactinoceras protentum M. Gordon, 1965 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1756673 on 2025-05-23