Kroh, A.; Mooi, R. (2021). World Echinoidea Database.
Echinosigra Mortensen, 1907. Accessed through: Kennedy, M.K., L. Van Guelpen, G. Pohle, L. Bajona (Eds.) (2021) Canadian Register of Marine Species at: http://www.marinespecies.org/Carms/aphia.php?p=taxdetails&id=123407 on 2025-04-03
Nozères, C., Kennedy, M.K. (Eds.) (2025). Canadian Register of Marine Species.
Echinosigra Mortensen, 1907. Accessed at: https://www.marinespecies.org/Carms/aphia.php?p=taxdetails&id=123407 on 2025-04-03