Kroh, A.; Mooi, R. (2025). World Echinoidea Database. Cassidulus conradi carolinensis Twitchell in Clark & Twitchell, 1915 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=763051 on 2025-05-24
Marine Species Traits editorial board (2025). Marine Species Traits. Cassidulus conradi carolinensis Twitchell in Clark & Twitchell, 1915 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=763051 on 2025-05-24
basis of recordCooke, C. W. 1959. Cenozoic echinoids of eastern United States. United States Geological Survey Professional Papers 321, III+1-106., available online athttps://pubs.usgs.gov/pp/0321/report.pdf page(s): 60 [details]