Kroh, A.; Mooi, R. (2021). World Echinoidea Database.
Echinus alexandri Danielssen & Koren, 1883. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2021) European Register of Marine Species at: http://marbef.org/data/aphia.php?p=taxdetails&id=124280 on 2024-08-08
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024). European Register of Marine Species.
Echinus alexandri Danielssen & Koren, 1883. Accessed at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=124280 on 2024-08-08